We recently purchased a 2005 Arctic Fox fifth wheel. It seems the previous owners limited their maintenance to keeping the interior clean.
Cleaning up the outside and checking the tires yesterday I found three different manufacturers and two different load ratings plus some hairline cracks in the sidewalls near the rim.
Doing a little research on the web it seems that at least one of the brands had a very high failure rate. Seeing that I hauled the rig to a local tire guy who gets excellent marks for quality of product and customer service.
Upon taking the old tires off we found four different brands, four different dates and two different load ratings. Plus, one tire was starting to split and would have soon failed. Urk.
I had assumed the dealer's safety check included the tires but it seems not. Buyer beware!
So, before you put any money on the line. Check the tires closely and avoid any unpleasant surprises.