[Notanlines]

I could find absolutely no info on a Carlton tire. Where might you be buying your tires? I would start by bringing your RV by a truck alignment center and insure that both axles are true and aligned. Insure that brakes and wheel bearings are in top shape, and then swap to a new set of Carlisle load range E from Walmart. Their price right now is about $63 per tire. Carlisle isn't my all time favorite brand, but it is a good brand with a great price. Go with the recommended PSI listed on the front driver's side of your RV. Never, but never run less PSI than recommended. I would recommend a cheap infra-red thermometer from Harbor Freight ($10-$20) and check often, insuring that all four tires are very close in temperature.
I might also ad that those wheels should not be on that RV. They look like they came from Tractor Supply, and are not a quality wheel.
I'm sure others will chime in with more recommendations as well.
On edit, I concur with the Maxxis brand also.