Our 2004 Tioga 27 foot 26Q has harsh ride on concrete highways that are cupped from big rig and weather wear. The ride is acceptable on smooth asphalt roads that are in good condition. The left lane on a 2 lane asphalt road is usually the smoothest but faster car and semi traffic gets on your tail so you have to go to the right lane if you want to drive at 55-65 mph. Some have suggested taking out one leaf of the rear springs to get less stiff suspension which may work on some rigs. I added rear air bags to our old 79 Delta 23 footer, it didn't help harsh ride. I recommend frequent rest stops to let your brain stop rattling. Tires seem to fail on hot days with pounding road surface.