We changed our 13" rims for 14" rims rated for trailer use in our Boler
awhile back. Put on trailer rated tires
. We were about half a mile out of the tire place when a pickup honked at us saying smoke was coming from the trailer. We stopped right away, and found that the new trailer tire, with its additional flex, was rubbing against the wheel well, causing everything to heat up and melt. It was so hot that the rubber bonded itself to the wheel well.
All this to mention that the inset of rims vary, moving the tire some. In our case, too much. Didn't notice it when it was being put on, as there was no weight
on it, and it spun freely. Also, the tire flex varies by type and tire height, so if your clearances are minimal, check things carefully.
Luckily, we had no fire, and the damage was minimal once we got the mess cleaned up. We switched to a flatter automotive radial tire, and have had no further problems, with more than 20,000 miles of travel in two years. The tire folks say there's not a lot of difference in trailer tires
and automotive tires
; trailer tires have stuff in the sidewalls that prevent uv damage, and they're built to flex more.
Bottom line -- check everything carefully before you drive off.