Do you keep original tires on rv when going to Alaska?

Personally I wouldn't worry about if provided they are newer, and in good shape. My 2012 Oudoors RV Timber ridge came with the Goodyear Marathons, which I believe are made in china, but held up really well. When I traded the trailer in the tires had something over 25 thousand miles on it and the tires looked great. My experience is trailer tires tend to age out long before they wear out unless you have suspension issues.