Battery Disconnect Switch!!!!
Jack Wheel if you are storing in a garage so you can move it around
---I got mine at Ikea, put velcro at the peak and and the bottom of both sides. I stick it before raising the roof. You can also fish it through the handles on the roof if needed.
Costco has some flat LED stick on type, but I didn't investigate yet if they would work outside and be able to stay permanently. Not sure they'd clear everything when it closes. Maybe around the base of the trailer though....might be fun.
We also reinforced the ledge the dinette sits on when using it for a bed as it fell though on us. My husband put a strip of wood down to the floor to gain full support. I think I posted the pics in another post, but will try to get them to my album.