One more question

Nope, not too much to do there. Some folks will spray their wipers with silicone spray, but I don't think it does any good. Just keep an eye on the roof of the trailer and the slideout. Watch for any cracks in the self leveling sealant and reseal and needed. I tell my customers to walk the roof twice a year. You wont have to do something each time, but look at it anyway.
I spray the slide-out drive screws and bars with silicon spray every year at least. It really takes the load off the electric motors when that all slides easily. It's easy to hear the difference.