Welcome to the RV Forum, where you can feel free to ask all your questions. ? Chet has presented you with some very good questions to consider and if you could reply with additional insight into your plans, we can give you some direction.
I would suggest you consider brands that are known for customer support and service, even if the local dealer disappoints you. ?IOW do not count on the local dealer for service, because most of the time they will disappoint you, and by choosing a manufacturer which has a history of reliable support is important.
Monaco, Newmar and Fleetwood are such manufacturers with factory service centers you can visit. ?In addition these companies attend FMCA
and other major rallies where they provide free service on your rig.
I do not have first hand experience with the other manufacturers you mentioned, but perhaps other Forum members can provide you with info.
Trailer Life Magazine, Motorhome Magazine and the FMCA Magazine contain reports of RV owners in their plights with RV manufacturers along with the outcome. ?These can give you some idea of how various companies deal with customer complaints.