Most Chevy based Roadtreks built after around 2002 have complaintys about the water tanks and their supporting brackets which hang down below the frame rails hitting the "ground". Several owners have had Moog springs installed in the front end and air bags at the rear suspension. I have had multiple Roadtreks of this model and like spacers under the front springs (Chassis-works of Las Vegas on E-Bay about $40 plus installation labor) and 3 inch spacers between rear axle and rear springs (about $50 for spacers, $40 for longer U bolts plus labor). These give an additional 2 1/2 to 3 inches of appreciated ground clearance.
The 6.0 liter Chevy gas engine is solid as they come. There was a little know service bulletin about what appeared to mimic high altitude vapor lock resulting in engine going into limp mode. This could be corrected by getting the sags out of that gas line run. There was an issue with difficulty getting gas to flow when filling the tank due to Roadtrek modification moving the filler spot to behind the rear wheel and running a narrow gas line in avariety of different ways to the tank. The sags reate back pressure tripping the fuel fill nozzle.
The engine and transmission cooling were a tad under size for really hot long up mountain inclines, solvable by adding a LARGE aftermarket transmission cooler.
We rarely stay in campgrounds and prefer traveling in hot weather so the generator can be useful to run AC. However we probably have more hours on the coach engines running at HIGH idle overnight to dash cooling which is quieter. One of our Roadtrek 190 Populars has over 200,000 miles on it running a lot at high idle overnight for dash AC with no ill effects on the engine.