Also, even if headed to a campground that has hookups its always a good idea to put 10 or so gallons of fresh water in the tank in case you need to stop and use the toilet or maybe wash up for some reason.
Screwdriver with multiple fittings for Phillips, flat, torx and that square head that seems to be so common in trailers. Pliers, duct and electrical tape, multi-meter. Teflon tape is nice too when the hose leaks at the fitting on your rig. Something to prop your fridge open when it is turned off and in storage so it doesn’t get mildewed. And if you want to make the investment it is really nice to have a cordless driver that has enough power to crank down (and up) your stabilizers so you don’t have to wind that tool on your own. You can use it to fix other things too of course. Folding step stool to reach up high depending on trailer design. Oh, also nice if you have a tandem axle trailer to have a “trailer aid” that lets you drive your good tire on the ramp so your blown tire is off the ground without needing a jack. Saves the headache of dealing with a jack and also much more stable and fast.
2018 Voltage 3305