Yes, I have an 05 Grand Canyon and I understand that 05 was their first market year. I think production may have started in 04 but let the experts answer that question. The tire question, I now have Goodyear G loadrange. This is the third set since March 08, 06 (purchase date). Original equipment was Loadboss and one blew (tread separated) after a mear 1500 miles. Fortunately my insurance covered the tires and damage to the trailer. Heartland only allowed $350 which I appreciated. LSI mounted MISSION tires which I got a bit more service out of and was only replaced after I noticed some steel belts coming through on one, (it looked like the brakes either locked or dragged on the one wheel). Haven't had the Goodyears on long enough to make jugement. I have less than 1000 miles on them. Four tires almost a grand.