OP here, thanks to all the folks who are providing suggestions for trailers and explaining steps in MH to me, but I have already considered all those things and made the decision to go with a gas class A MH. I have a number of years experience with several TT's and have spent some time in a Class C. I have gone to large shows to look at various options and determined that a Class A will be the best option for me.
Again, what I am looking for is advice on what age MH's should I be looking at if I want to use it for at least 10 years as a fulltime home. I am looking for something that both the motor and the house are durable enough to still function after years of use.
Thanks to those who have already answered my original question.