My local tire guy will install tires on anything, from lawn mowers to eighteen wheelers and anything in between. I hauled the trailer to his shop, he jacked the trailer up one side at a time, and removed the old tires, swapped out for new ones, balanced the tires, and reinstalled them. In and out in about an hour. Most places that specialize in tires should be able to help you, no need to go to an RV store.
Richard L. Ray
SSgt USAF (Retired) Life Member DAV
W4RLR 146.52 mhz
2008 Ford F-250 Lariat Crew Cab
1995 Jayco Eagle 277RBSS fifth-wheel
"Never ask a man what kind of computer he drives. If it's a Mac, he'll tell you. If not, why embarrass him?" Tom Clancy