I have a 2011 Raptor 30FS purchased in June 2013 that's in like new condition, the previous owner only used it a few times before trading it in on a motor home. I just took a trip from central Florida to southern NJ for a bike rally in Wildwood, with a 4 day stop in Delaware for the Ocean City Bikefest. On my way home just south of Walterboro, SC on I-95 the left-front tire blew....Tow Max STR (ST235-/80R16). The blow-out was caused by tread separation. While being examined by the local tire dealer, he noted that the date of manufacture was August 2009! Apparently Keystone (or their tire distributor) had these things sitting around for a couple of years before installing them. The upshot is, tire warrantee's generally expire after four years (even though the tread depth is 9/32" and hardly worn). I have a two year old Raptor with four year old tires! Luckily, the only damage to the trailer was the side clearance light wire being pulled from the device and broken. As the second owner, I don't have the original purchase paperwork so I can't even make the "four years from purchase" argument; the only thing they'll go by is date of manufacture. Needless to say, I'm replacing all four with something other than Tow Max!