Did this mod prior to a big trip where I needed some additional storage. I thought about doing a platform across the tongue but decided on the box instead. Here's what I picked up. It's an aluminum box from Harbor Freight tools. One cross brace was removed and cut into "L"s to be used as mounting points where I bolted it through. Big hole for the regulator. The propane and battery are inside with plenty of room to spare. I mostly store tools and tarps, straps and whatnot in it. You can't get into it when the bunks are out so plan accordingly. Had to knock off the support points, so the poles are now wedged into the brace by the chains. The tongue jack doesn't snap all the way down, so I have to secure it with a strap, and until I fabricate an extension I crank it like this...D(flip), D(flip), D(flip) But it's been a most useful addition to the pup.