Never seen a maint sheet but if you check out the manuals for the different equipment your rig came with, there will be specifics in them usually in the back under maintenance.
I do a spring roof walk, cleaning and checking all sealant and looking for anything that needs a fix. Also a walk around, checking sealant around windows, lights, seams.
Check the jacks and stairs and give them a squirt of silicone spray for lube about every 2-3rd trip.
Check tires for air pressure prior to every trip along with lug nuts are tight. Include the spare.
Check bearings and seals every spring. grease and replace as needed.
Wash about monthly.
Use the air compressor to clean any spider webs, dust, dirt from frig, WH vents, etc.
Touch up any steel straps that might have a little rust on them. quick rub with a steel bristle brush and some spray rustoleum.
Clean AC filter (inside) and gently spray AC after removing the cover on roof to make sure it's clean.
Do all the same in the fall before I winterize with the exception of the bearings/seals. Thats a springtime and prior to long trips thing for me.