I run car tires on our trailer. Replaced them a year ago. They still looked okay but were aging out. Didn’t want trouble hauling a car back rom Kansas.Some tire shops won't install passenger tires on a trailer. Probably cause passenger tires sell for much higher.
Who knows. They claim it's liability. One can sign a waiver if needed for such issues.
Went to Sam’s a few years back. They came in and told me they couldn’t install the tires I wanted because it wasn’t the OE size for my truck. I had run that size for 4 years prior. Went to Freddie’s and got the size I wanted. They were a little bigger than what came on the truck originally.