Camper Overhaul?

I'm getting ready to take my camper out after it basically sat for 2 years. It's had antifreeze, which I renewed, and the hot water tank has been drained and standing with the plug out all this time. Replaced one tire that had dried out and gone flat, then used vinal/rubber renewer on all of the vinal, rubber, tires etc. Any suggestions on things I'd better do to get it ready to go back out?
Any advice appreciated!