Just graduated to a travel trailer after a few years off. Started out with a tent then had a couple of pop-ups so never too complicated an abode. I'm wondering what everyone has in their basic too...
One item I find essential is a flashlight that straps around my head, like a miner's lamp. At some point you will need to do some operation with 2 hands, behind the RV, in the middle of the night. This lamp puts light right where you're looking.
I have a set of screwdriver bits with a large variety of bits. Very cheap but it works for a while. I'm now looking for another 3mm hex bit to replace the one I stripped putting the IKEA shelves together.