If your car hauler is an enclosed car hauler you can use it to move as long as you do not exceed the maximum tongue weight that your particular 2006 Ford F-450 and the gross combined weight rating of the vehicle. If your car hauler is an open car hauler (without rails) it is not a good idea to tow household cargo on it. I was able to find your owner's manual and the GCWR depends on the engine and transmission. The gross combined weight is the weight of the loaded vehicle, including passengers/cargo... view full answer...