Todd has his mounted on a small deck off the back of his trailer, much like the pellet envy trailer if you have seen either of them.
I keep mine in the garage of my 5th wheel, strapped down, and roll out to cook on. I put larger pneumatic tires mine so that it would roll around easier, as well as lengthening the wheelbase. I also have a 30' gooseneck with a 10' covered deck/20' enclosed -- and it would easily take a an FEC mounted on the rear. I have toyed with putting one on there. as it is, I roll mine on and strap it down if I use that rig.