I see nothing wrong with your plan. We are not retired yet but plan on using a toyhauler for our fulltimer rig when we get there. I wouldn't let a bad experience scare you off of a class A if you liked it otherwise though. There are benefits to each rv type and you can get a bad one with any type so if that is your main reason for making the switch, it may not solve your issue.
Was it a Used rig or New? Were the problems things you could have or should have caught during inspection prior to purchase or just bad luck? I guess what I'm getting at is maybe being more experienced as an RV buyer now, you'll know what to look for better and what to avoid. If not, maybe you can have it checked out for a fee by an uninvolved party such as a RV shop that is not involved in the sale of the unit or a good friend that has RV experience and mechanical aptitude.
Good luck in round two!
2015 GMC 2500 Denali Crewcab 4x4
2019 Forest River Wolfpack 23pack15
Hope your travels are safe and the friendships made camping are lasting.