Stay with the same size and load rating so you don't have to worry about rear dual spacing and rubbing on the tire wells up front. Your placard pressures should be the same but verify with the manufacture you choose to go with. Consider second tier manufacturers such as Kelly, Cooper, Dunlop or Uniroyal.
I've had Kelly Armorsteel tires on the coach for 50,000 miles. No abnormal tread wear, no sidewall deterioration, no cracks or splits and at 1/2 the price of an "RV" tire. The only cleaning agent I've ever used on the tires is soap and water along with keeping them covered when the coach is home. No 303, Armor All, Tire Shine or other so called preservants. No complaints with the ride and driving back to back 500 mile 12 hour days isn't a problem.
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2006 Hurricane 31D built on a 2006 Ford F53
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