This has nothing to do with Montana but I need some info from our tire/wheel guys. I have a 2010 6'X12' enclosed CM cargo trailer. It did not come with a spare tire so I am looking at buying one. There is a place near my home that sells tire on wheel for spares. CM Manufacturer says the wheels on the trailer are 5 on 4 1/2" Chevy. The guy who has the tires/wheels says they don't make a 5 on 4 1/2" Chevy. The reason I don't want to buy a spare from the manufacturer is of course, the price. About double compared to the other guy. Can someone give me some info on this? Thanks.