I'll 2nd the break adjustment and repack the barrings every spring. Its not that hard of a job maybe 2 hours.
I'd also add flushing out fresh water system and hot water tank. We have a rubber roof so I get up and wash it after uncovering it and use a UV protestant conditioner on it. I'd like to say I wash and wax the whole camper, but to be honest I wash all of it, and wax the front cap and when that done I'm usually ready for lunch and always say I'll come back after lunch and finish up but never do.
I did find a guy who washes and waxes boats this spring and he did my whole ca