Sonny54 - In general you can break down motorhomes into three categories, vacation, snowbird, full time. Full time means you are going to use things a lot and they need to be built to take that level of use. Prices of new motorhomes go up when you go from vacationing to full time, a lot. So do used ones but the climb in price is not so steep.
So if you are going to live in it full time make sure you get a rig built to take that use.
In general diesel motorhomes either pushers or front motor are built heavier than gas rigs. But these days gas motors go a very long time.
You also should consider your use when full time. Are you going to go around the country mostly or are you going to stay in one place for months at a time and then move on. If you are going to move a lot you want something you really like to drive. Many standard truck chassis ride like UPS trucks or worse. Many diesel pushers are quite luxurious when driving.
We do not full time, but the motorhome in my signature line would be considered a full time capable rig.