Another question as I am preparing to replace tires on my fifth wheel. I am replacing due to age, not due to wear. Question is with regard to the spare. I know the best thing to do is replace all 5...
Agree with above, as to need to replace spare. Age matters, and a tire not being used, can become rotted, more so than one being run at highway speeds.
Only you know, how your spare has been treated. Out of sun, properly inflated, and not more than 10+ years old? Are you towing long distances, or full timing? IMO, unless you fall under one of above, I'd use the current spare, rather than buy new, just to hang on the trailer.