I saw a spare tire that was mounted on the rear bumper of a 5th wheel and covered with a nice cover. The tire blew up on the bumper and blew out a hole in the cover. Cheap Chinese junk. I run only LT tires on my trailers and have never had a problem.
The first thing I did to our new toy hauler pictured below was to put 6 Michelin XPS Ribs truck tires on it. Cost me $2100 but well worth it. No tire problems in 3 years. The cheap Chinese tires that were taken off had gone from the Indiana plant to Tucson AZ and looked about worn out.