I'm with the trailer/truck group. You'll get move living space in a trailer/fifth wheel than a class A plus you'll have a vehicle for general day. You don't need a monster duel rear wheel truck to tote around a good size trailer or fifth wheel. A diesel powered Ford F250 or Chevy/Ram 2500 series will pull a 30-40 towable with ease. With a class A you have to deal with maintaining two motorize vehicles along with the additional cost of insurance and such. Other than connecting and disconnecting set up and tear down isn't much different. You still need to level/stabilize, connect water/power/sewage, awning, slides, outdoor seating,,,,
Yearly maintenance cost will vary with age of the coach, if you can do the maintenance, if buying used how did the prior owner maintain the coach and location (cost vary across the country). Maybe $2000 to $3000 a year maintenance budget will see you through but you'll need to figure in tires at some point in time. Very few owners will wear out the tires on a coach. They usually rot first. Maintenance isn't difficult and there are a lot of owners posting videos on You Tube showing various ways to do things. If you must use a service center costs can climb to the boat level very quickly. Power train and chassis maintenance is either a usage/mileage or calendar interval so even if you hardly drive the coach you shouldn't neglect the chassis.
I have a class A because we like to travel not stop at one location for an extended period of time. Our longest stays are measured in days but we're not full timing, yet. If our travel plans change to more stay time and less road time we would shift to a fifth wheel/truck. You're plan will certainly work but you might be better suited with a trailer/truck set up.
2006 Hurricane 31D built on a 2006 Ford F53