They installed F rated instead of G rated. The MH came from the factory with G rated so noway should a lighter tire be installed. I didn't pay any attention until I had the blowout and GY said that the f rated was to light for the MH I have. I "assumed" that CW installed the correct tire. Good Year even tried to get CW to help with replacing with the correct tire. Now to be honest the tires I bought from them was in August 2010 and the frist blowout happened in 2012. I have had the MH weighed and its well in its limit. I always check tire pressure before I leave out. Never have hit any curbs as I know sidewalls are a problem. GY has inspected each blowout and in their opinion it is tire failure due to wrong rateing.