Most Gassers come with 5,000 pound hitches and can not tow that much safely.
Stacker Trailers have been around for some time.. I've seen them.. Some of the photos above look home made (no comment as to which) which is not necessarly a bad thing, but some of the better ones have lifts (like some Auto Service shops) where you drive one car on the Hoist or pull a boat onto it (A whinch may be provided,, Lift it a bit and tie it down (lift so it is easier to work on) then run it up all the way, and drive another vehicle under it and tie it down. Toss in the safety latch pins and you are good to tow
With a Diesel that can pull over 10,000 pounds... Workable.
