The items listed below are only the very minimum basics that you will need. Items that are hyperlinked are my preferred brands and models that I like or personally use. You can of course use any brand or type you like.
Safety
Drinking Water
Sewage
Rubber Gloves
Regular garden hose for rinsing and cleaning during dumping
Electrical
Extra light bulbs
Electrical adapters – 30 Amp, 50 Amp and 20 Amp
Heavy Duty Extension Cord
Setup
Misc.
Eternabond 2" Tape to patch your roof if it ever gets ripped or torn
Dicor Self-leveling lap sealant to seal around stuff on the roof if needed
Portable battery jumper and/or jumper cables.
Jack and lug nut wrench for changing tires.
Electrical and duct tape
Extra motor oil and transmission fluid
Flashlight
Screw Driver Set