That's too much pressure, which is why the ride is harsh. If you consult the Michelin tire pressure charts (after getting your rig weighed), you'll find that they actually recommend less than the 61 PSI that Winnebago recommends. There's no reason to exceed 61 PSI and I run ours at 55, which greatly improves the ride quality. That said, we have a TPMS system installed, so I can monitor them, and we get an instant warning if the pressure drops below 50. If you don't have TPMS, I highly recommend you install a system, as it takes all of the guesswork out of monitoring your tire pressures and provides a significant safety benefit. Without TPMS, you need to check your tires regularly with a good-quality pressure gauge, and stick to 61 PSI or more as a safety margin, and live with the harsher ride.