I found some almost new, hardly used goodyear marathons at work that are the right size. They are $10 a piece. I have read a bit about other people using trailer tires on passenger vehicles and would like to get a general opinion on using these. They are E range 235 80 or 85 16, I can't remember. They look good, but I don't know if they are the "circle S" ones. They will be used for drives until I can afford proper tires. Thoughts please.