Karl, thanks for bringing this up, I've been thinking about adding one to my F150 for a while, but at $14,000? Ouch! I think I'll stick with the tent, or the Motel 6.
But I don't do the weeks long road trips you do, so for your millage and many trips to FL from MN, it makes sense.
What you also need is some way to 'home brew' diesel fuel! Then stop at every BK and MickyD's on the way down and pick up their used fry oil or something!