Installing the 18,000 or their slightly larger 24,000 Hayden LDP cooler in your Ford mini-van is a great idea.
Luckily, I don't drive far each day and thus, don't need a "gas savings" vehicle. If looking for a vehicle that will carry 4 comforably (and with option of 3 across the rear), have some decent pulling power for a small TT yet be small enough to still park between the skinny yellow lines, my next vehicle would probably be a Ford Sport Trac 2-wheel drive with V8 engine. For more details, surf: http://www.ford.ca/pdf/brochures/11223_en.pdf
And, I'd keep my mini-van for grocery shopping, local "run abouts" and for passenger hauling. And, I'd use my mini-truck (soft of speaking) for hauling and towing. And for large loads, I'd use my mini-Pickup with my 6x10 landscape utility trailer (that has its own brakes).
This specific mini-truck might work for you as well...