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You are not saying what type of trips you are planning.I think 6 ply tires for short trips would be just find.If you are going cross country I would go to my local tire dealer and get some good quality tires with the correct weight rating and don't worry about it.I have run 10 ply tires and have lost rubber on them and was told it was overkill on those tires.I went to a 6ply and had no problems.
You might move this one to the towing forum. No one uses ply rating anymore on tires. Just look at the capacity in x pounds @ y psi on the sidewall. You need to know the "wet" weight of the camper, that is, with full water, propane, ice, etc. I have an extremely light (985 dry) 8' camper that an F-150 with passenger tires carried with ease. They vary a lot in wieght.
Be sure to get tires that have a good integrity history. I have had 3 tires fail which were Carlisle brand. They were inflated to 35 lbs., not overloaded and not old rotted tires. They were mounted on my 2-axle, 3600 lbs. Tahoe trailer, total weight at about 3750 lbs., including load. I have heard rumors of class action litigation against Carlisle for the alleged high failure rate.
You might move this one to the towing forum. No one uses ply rating anymore on tires. Just look at the capacity in x pounds @ y psi on the sidewall. You need to know the "wet" weight of the camper, that is, with full water, propane, ice, etc. I have an extremely light (985 dry) 8' camper that an F-150 with passenger tires carried with ease. They vary a lot in wieght.
Jim
I agree, everyone is running different sized tires for different applications and looks, best thing is to go by weight rating on the tire it self. give your self some room, if you are right at the max rating, I'd suggest going to a better tire for the application.