http://www.michelinrvtires.com/miche...ion-tables.jsp
this is the only reference to a 17.5 tire I found. The ones on my trailer are
NOT trailer tires--they are hiway rib truck tires. I am a firm believer that if a tire can run on a truck, and it meets the load rating I need, then it is fine for a fiver.
Check on the link I listed above and talk to the guy who knows tires (this is a hardware store in NW Ohio, and the guy really knows trailer wheel/tire combos--he will ship anywhere) to see what he says you might try. I got the link from Ron Sigo (sigo'nsuites) who used to be a regular on this forum.
Joe