The Wilderness has metal siding. One time some of it started coming loose. At the time I wished I had had a putty knife to force it back together. Now I do :)
Air compressor, I use an old B&D "Air Station", 110 V. I wisht I either had a 12V compressor, or an inverter. Some day LOL
I find "headlights" to be handier than flashlights, but I have both.
At first I was getting into my tool box and packing up a bunch of stuff that made me feel good to have. I started shopping used tools and put together a tool kit just for the camper.
1/4, 3/8, 1/2 drive sockets inch and metric, some deep sockets u-joints, extensions, ratchets, breakovers etc. Got a 3/4 drive breakover and socket for truck tires. Got a set of both inch and metric combo wrenches, 4" thru 12" Cresents, a few odd end wrenches, ratchet screwdriver w/ all the bits that fit in the handle, a stubby Phillips and straight blade s'driver, a few kind of pliers, a 2 lb ball pein hammer, other stuff I can't recall at the moment.
Several kinds of tape, wire, crimp splices and pliers, pipe dope, teflon tape, hose washers, spare requlator, who knows what else.
Sometimes I even have something I NEED :)