Having a little bit of trouble finding a spare wheel for my trailer. I ask several tire places and they say it a Chevy wheel 15". Had a blow out today and my Chevy spare would not fit so I had to limp to the tire shop after hours. How can I identify what kind of wheel I need. Even the guy that built it said Chevy 15 inch would work. I can't find a knowlegeble tire mechanic around here so what's my next step. I really need a spare.