The Trail Express tires that Forest River put on their campers are complete and total JUNK!! The ones that were on our 2012 Grey Wolf 26BH were weather checking when they were only 16 months old (going off the build date on the tire) and our campers are stored inside when they are not being used. I have 2 friends, one with a Grey Wolf and other with a Salem Cruise Lite, both are 2013s and their tires are wore out with less than 3000 miles on them.
I replaced mine with a Hercules Power STR trailer tire, and I also went up a size to 215/75/14 to get a bit more load capacity (1870 vs 1760 for a 205). I know 110lbs per tire isn't a big difference but the 215 was only $4 more than the 205. After 2 years and probably 3000 or so miles on the Grey Wolf the tires were wearing so good I had them put swapped onto our "new" 2013 Passport 3220BH in place of the 205s it had.