Here's the archived brochure on this coach.
According to the brochure, this coach has the RR4R chassis, which means 4 air bag chassis. These are the chassis with the reported trailing arm failure problem.
You need to find out if the suspension trailing arms have been replaced, preferably by Source Engineering.
Some report that this chassis rides very rough, and that in addition to new replacement heavier designed trailing arms, Source Engineering also have a kit to improve the ride.