One problem related to carrier/rack has been reported for the 2010 Ford E-450. The most recently reported issues are listed below.
The vehicle is a 2010 fleetwood jamboree sport 25g motor home on Ford e450 chassis. The mounting brackets for the propane tank cracked and the propane tank was close to falling off the vehicle. If the tank falls off while driving it will break the hose on the way out, leak high pressure propane, be hit by the rear tires and likely lead to a crash and fire. Its obvious with one look the brackets are poorly engineered and likely to fail with time. The propane tank is suspended from two simple l-shaped angle iron brackets with no gussets and no support of the far end of the brackets.