I don't know your RV so I don't know how hard an oil change and lube job is. On my RV I can reach every zerk, and the oil pan and all WITHOUT.. a jack or hoist, In fact most often the tech who does my oil changes does it that way. NO hoist, NO grease pit, just a crawler.
If yours is like mine,, Well carrying the tools to change oil is easy. and most Wal*Mart's and many other places accet oil to recycle.
If not. Well... My Regular Service dealer charges only about 60 bucks (Semi synthetic) and Camping world 100 to put in the WRONG oil. (Mine is a gasser) Many truck stops also do oil changes at the 100 price range Plus there are other Truck service shops.. Used to be one in Oconee Co SC I really liked but they closed.
One of the most amazing things I found.. The lowest cost oil change I ever had done, and they used the specified oil too. was done at an AUTHORIZED SERVICE CENTER... (He too used a crawler, not a hoist)
So you might check with the chassis maker as to who is authorized.
He only made one minor mistake (Forgot to reset oil life indicator so I had to do the reset procedure myself a week later).