You didn't say what you're buying for a DP - can it handle a hydraulic lift on the rear for the bike and then tow a Jeep or something four down?
I'd sell the Tundra and find a (smaller) truck that can be towed four down and put the bike in the back of it. That would be your cheapest option.
And check the tow ratings on the DP you're buying, a stacker with a bike, car and other junk may exceed your tow rating. I did see an interesting stacker last year at the Las Vegas drags being towed behind about a 2005 Excursion that had a dolly under the front end of the stacker. There's nothing that money can't solve.
Bill
