I "tow" a 36' Grand Design solitude which is just shy of 12K pounds with a 2006 Dodge Ram 2500! Now I had to add helper springs and go with tires that will support the loads. As mentioned with 5th wheels you have between 20 and 25% of their weight in the bed of the pick up, add another 500 pounds for the hitch, plus all the things people and pets, you have to be able to SAFELY carry that weight, as well as being able to stop! Yes it can be done, check your weights, tires, etc. but it can be done.