It can be a bit of fun finding places willing to change oil on a class A.
Many shops the door is not high enough.
I've been to Camping world (Do not suggest going there, won't ever again) They screwed it up 2 ways.
I've been to a Chevy dealer who had a bay big enough (Best deal I got on an Oil Change) They charged the same as a Silverado Pickup (Well same engine. Same oil. Why not) Only difference is they did not put it on a hoist. just slid under on a crawler.. There is more to the story but that goes in the HUMOR section (They did the oil change correctly)
And an independent RV dealer which was also the School District Bus Garage.. My #1 Suggestion is find out where the local school system gets the oil changed on the busses.