On smooth roads, most Class C's are reasonably nice to travel in. On concrete intertstates, with cupped sections caused by semi's and weather, the constant jarring and thumping and hard ride due to stiff rear springs and 80psi duals, can wear you and the rig down especialy in hot weather. Best to stop every 100 miles or so and stretch your legs, sit quietly for 10-15 minutes, and take off refreshed. There are suspension improvements that can be made, but after all it's a fairly heavily loaded , flat sided, truck with stiff rear springs that gets kicked around by passing semis and wind turbulence.