JMO, we just bought an 07 Tiffin Open Road gasser last October. We weren't really actively looking for a moho yet, but this one kinda fell in our laps. At that age my biggest concern was how well it was taken care of. Ours had 43K on the clock and the rest of the coach showed about the same. It had some issues, but I'm VERY mechanical, so non of what I found concerned me. Stick to higher end name brands and you should be fine. HR, Tiffin, GBM, Winnie, and the like.
The tank level indicators always said full on the black and grey tanks, The bedroom slide didn't extend or retract, but you could hear the motor spin. The decals were cracked from age and sun damage. Tires were at 6 years old and starting to dry rot. That and it needed a good cleaning inside. We got ours for well under the book value because of the "issues".
After driving it home 1,100 miles towing the Ranger on a car trailer, it took us 2 days to get everything fixed or sorted for 0 money. We presently have 51K on the clock and over 45 days "camping" in her. She goes in the 18th for drivetrain and chassis fluid changes, a new acc belt on the engine, and front end alignment. We will be leaving in May for a PNW tour and to visit friends. We plan on being gone till the end of July. Finish the house, sell it, and go fulltime.
We thought about a diesel, but after owning diesels for decades and the cost premium of maint. and purchase price.....that buys ALOT of regular gas. We're retired and don't do "hurry up" vacations anymore. We don't usually drive more than 300 miles a day and boondock most of the time.