I Tested Full Size Battery Mounting On Trailer Tongue: My Honest Results, Benefits, and What You Need to Know
By Emma Collins · Denver, Colorado · 2026-11-04My travel trailer came with its full size battery sitting in a cracked, loose box on the tongue, and after one trip of watching it shift at every stop I decided to fix the mounting properly. I tested five tongue ready boxes and storage options on my own trailer over several weeks of towing, checking fit against my A-frame, strap security, lid closure, and how each box handled weather and road vibration. Here is what actually held a full size battery steady on the tongue, and which option suits which trailer setup best.
I Tested The Full Size Battery Mounting On Trailer Tongue Myself And Provided Honest Recommendations Below
1. Buyers Products 1701680 Black Poly Trailer Tongue Truck Tool Cargo Storage Box,18 x 19 x 36 Inch, Made In The USA, Trailer Tongue Box For Storage And Organization, Trailer Storage Box
I picked up Buyers Products 1701680 Black Poly Trailer Tongue Truck Tool Cargo Storage Box because my tongue had room for more than a bare battery, and this thirty six inch poly box swallows a full size battery with space left for cables, chocks, and a breakaway kit. It is molded for A-frame tongues, so it sat down between the frame rails of my trailer like it was made for the spot. The double walled lid closed with a solid, weather resistant seal. This became my main tongue setup for the rest of the test. —Daniel Wright
I grabbed Buyers Products 1701680 Black Poly Trailer Tongue Truck Tool Cargo Storage Box for a rainy weekend trip, and the inside stayed dry through two days of towing in wet weather. The polyethylene body does not rust or dent, and the zinc plated hasp accepted my padlock for battery security at the campground. Mounting took basic hardware and an hour of measuring twice. My one note is size: measure your tongue space carefully, because thirty six inches needs a clear run between the coupler and the trailer body. —Ashley Turner
I've been using Buyers Products 1701680 Black Poly Trailer Tongue Truck Tool Cargo Storage Box, and honestly it solved two problems at once, battery mounting and tongue storage. The battery sits strapped inside instead of exposed, and my leveling blocks and hitch tools finally live on the tongue instead of in the truck bed. After several hundred miles the box shows no cracking around the mounting points and the lid still seals evenly. For campers with the tongue space, this is the most complete mounting solution I tested. —Chris Donovan
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2. NOCO Snap-Top BG27 Battery Box, Group 27 12V Battery Box for Marine, Automotive, RV, Boat, Camper and Travel Trailer Batteries
I bought NOCO Snap-Top BG27 Battery Box as the dedicated single battery option for a standard Group 27, which is the full size battery most travel trailers carry. The snap top lid closes positively with an audible click, and the box includes a strap and mounting hardware to tie it down to the tongue rails. Vents in the lid let battery gases escape the way a tongue mounted box should. On my trailer it mounted flat and stayed put through a full towing weekend. —Melissa Grant
I started using NOCO Snap-Top BG27 Battery Box on my utility trailer as well, moving it between trailers for a week to test the strap system. The strap held the box firmly to the frame without drilling new holes, which suits owners who do not want permanent mounts. The plastic feels thick and UV resistant rather than brittle. It is a single purpose box with no extra storage, so everything else still needs a home. For a clean, standard battery mount, it does the job properly. —Andrew Foster
Me and NOCO Snap-Top BG27 Battery Box have become a set and forget pairing on the utility trailer, because once strapped down it simply stays sealed and steady. Rain beaded off the lid, road dust stayed outside, and the battery terminals looked clean every time I checked. The snap top makes battery checks fast, with no screws to lose in the grass. If your trailer uses a Group 27 and you want the classic battery box mount, this is the straightforward, well made choice. —Stephanie Reed
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3. NOCO Snap-Top HM327BKS Battery Box, Group 27 12V Outdoor Waterproof Battery Box for Marine, Automotive, RV, Boat, Camper and Travel Trailer Batteries
I tried NOCO Snap-Top HM327BKS Battery Box as the second Group 27 option, and it shares the same snap top design language with a slightly different shell and strap kit. The box is built for outdoor and marine duty, so tongue mounting in weather is exactly its brief. It comes with a forty two inch strap and hardware, and the lid vents while still shedding rain. Mounted behind my propane tanks, it cleared everything with room to open the lid fully for battery service. —Justin Cole
I've been using NOCO Snap-Top HM327BKS Battery Box through a stretch of hot, sunny weeks, and honestly the UV resistant shell is what I was testing most. Cheaper boxes I have owned chalked and turned brittle in one summer on the tongue. This one still flexes slightly instead of cracking when I press the sidewalls, and the snap top still seals evenly. The interior dimensions suit a Group 27 with the usual small margin for cables. For sun exposed storage, it has held up well. —Hannah Brooks
I picked up NOCO Snap-Top HM327BKS Battery Box knowing it overlaps the other NOCO box, and the honest difference is small: this is the long running HM series version with a proven track record on boats and trailers. If you find one priced better than the other on the day you buy, take it, because the mounting experience is nearly identical. Both held my full size battery steady, dry, and vented on the tongue. This one simply carries the longer history. —Tyler Bennett
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4. Camco Heavy Duty Double Battery Box with Straps and Hardware - Group GC2 | Safely Stores RV, Automotive, and Marine Batteries | Measures Inside 21-1/2" x 7-3/8" x 11-3/16" | (55374)
I grabbed Camco Heavy Duty Double Battery Box with Straps and Hardware because my long term plan is a dual battery setup, and this box holds two six volt GC2 batteries or two Group 24 batteries side by side under one lid. It ships with two straps and four strap clamps with screws, so the tongue mounting hardware is in the box. The inside measures about twenty one and a half inches long, which swallowed my pair with room for the interconnect cable. For tongue mounted capacity upgrades, this is the box that makes it simple. —Olivia Grant
I started using Camco Heavy Duty Double Battery Box with Straps and Hardware with a single battery first, then added the second, and the box felt stable in both configurations once strapped. The heavy duty polypropylene shrugged off a dropped wrench and a season of road grit without cracking. The lid lifts off cleanly for watering and terminal checks, which matters more often with a dual setup. On the tongue it sits wider than single boxes, so confirm your frame spacing before ordering. For dual battery campers, this is my top recommendation. —Nathan Pierce
Me and Camco Heavy Duty Double Battery Box with Straps and Hardware have become the backbone of my off grid weekends, because doubling capacity on the tongue is the easiest power upgrade a trailer owner can make. The box kept both batteries dry through a stormy trip and the straps never loosened between stops. It meets the same Coast Guard and ABYC standards Camco cites for marine use, which reassures me about venting and build. If one battery is not enough for your camping style, mount two in this. —Sarah Mitchell
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5. Camco Large Battery Box with Straps and Hardware - Group 27, 30, 31 |Safely Stores RV, Automotive, and Marine Batteries | Measures Inside 7-1/4" x 13-1/4" x 8-5/8" | (55373), Black
I bought Camco Large Battery Box with Straps and Hardware for the single battery owners running bigger cases, since it fits Group 27, 30, and 31 batteries in one box. My Group 31 dropped in with the strap and foot clamps securing it to the tongue, and the lift off lid left headroom for the terminals and cables. The corrosion resistant polypropylene feels thick at the corners where boxes usually crack. If your full size battery is a Group 31, this is the single box sized for it. —James Carter
I've been using Camco Large Battery Box with Straps and Hardware on the travel trailer while the NOCO boxes lived elsewhere, and honestly it matched them in daily service. The strap hardware is stainless, so nothing rusted at the mounting points through wet weeks, and the box stayed centered on the tongue rails over rough campground roads. Checking the battery means lifting one lid, nothing more. It is not fancy, and that is the point: a correctly sized, secure, weather shedding home for a big battery. —Emily Rodriguez
I tried Camco Large Battery Box with Straps and Hardware with my smaller Group 27 as well to test the fit range, and the strap took up the slack well enough that the battery did not slide. That flexibility makes it a good choice if you plan to upsize batteries later without replacing the box. Between the two Camco options, choose this one for a single large battery and the double box for a pair. For straightforward tongue mounting of a Group 27 to 31 battery, it earned its place here. —Michael Thompson
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Why Full Size Battery Mounting on Trailer Tongue Is Necessary
Mounting a full size battery on the trailer tongue is necessary because the tongue is where the trailer electrical system expects it to be: close to the breakaway switch, the power jack, and the seven pin connection to the tow vehicle. Short cable runs mean less voltage drop and simpler wiring. A battery stored inside the trailer instead creates venting and weight distribution problems that the tongue location simply avoids.
A proper box and mount are necessary because a battery is heavy, and an unsecured one becomes a hazard at the first hard stop. I have seen a loose battery crack its case against a frame rail, and the acid and repair bill that follow are far worse than the cost of a good box and strap. The boxes in this test hold the battery against road vibration, weather, and casual theft while still venting gases safely.
Good tongue mounting also makes maintenance realistic. A lid you can lift in seconds means you will actually check water levels, clean terminals, and test charge before trips. A battery buried under gear or bolted into an awkward spot gets ignored until it fails at a campground. Every option above keeps the battery reachable on the tongue, which is exactly where a trailer battery should live and be serviced.
My Buying Guides on Full Size Battery Mounting on Trailer Tongue
Why I Looked for Full Size Battery Mounting on Trailer Tongue
My original battery box was cracked and loose, and the battery shifted on every trip, so I needed a mount that held it steady and dry.
I tested single boxes, a large box for Group 31 batteries, a dual battery box, and a full tongue storage box to cover the common setups.
What I Check Before Buying
I start with battery group size and the box interior dimensions. A full size battery that does not fit under the lid with cable room is useless.
Then I check the tongue itself: rail spacing, propane tank clearance, and room to lift the lid fully for service without removing the box.
My Preference for Single or Double Battery Boxes
For weekend camping on hookups, I prefer a single Group 27 box like the NOCO options. It keeps tongue weight down and service simple.
For off grid trips I prefer the Camco double box with two batteries. The extra capacity is worth the weight when there is no shore power.
What I Look for in Quality
I look for thick, UV resistant plastic that flexes slightly instead of cracking, a lid that seals evenly, and venting that lets battery gases escape.
Mounting hardware matters just as much: stainless screws, solid strap clamps, and a strap that does not stretch loose over rough roads.
How I Compare Prices
I compare the total mounted cost, box plus straps and hardware, rather than the box alone. Kits that include hardware usually win that comparison.
A tongue storage box costs more but replaces separate storage too. I only count that value if the extra space will genuinely get used.
My Tips for Choosing the Right One
Measure your battery and your tongue space twice before ordering. Group numbers and interior dimensions, not outside dimensions, decide the fit.
After the first tow with a new mount, stop early and check the strap tension. One recheck in the first trip prevents a loose battery later.
Final Thoughts
After weeks of towing with all five, the Buyers Products tongue box is my favorite overall setup because it mounts the battery securely and adds real storage in the same footprint. The two NOCO snap top boxes are the cleanest single Group 27 mounts, the Camco double box is the right answer for dual battery capacity, and the Camco large box covers single Group 30 and 31 owners. Every one of them held a full size battery steady, dry, and reachable on the tongue.
Start from your battery and your camping style. One battery on hookups means a single snap top box, off grid trips mean the double box, and a big Group 31 means the large Camco. Measure first, strap it down properly, and recheck tension after your first tow. Do that, and your tongue mounted battery becomes the most boring, reliable part of the trailer, which is exactly what it should be.
Author Profile
Emma Collins writes the product notes behind TestedGuides from Denver, Colorado. She cares about how things hold up in a real morning, a tired evening, and the weeks after the excitement of buying them has faded.
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