We have a Coachmen 28QB. It's 32' bumper to bumper. Axle weights are about 7700 rear and 4400 front. We set tire pressures based on these weights. Handling and ride are both very reasonable. We're on Generals and have no complaints. We've had this brand on Suburbans in the past and were not impressed with the wear. But as someone noted, these will age out long before they wear out!
Find a unit you like and do your research. If you don't feel comfortable with the weights, move on to another.
Good luck,
Gary
Gary