Ford Transit (full size) for towing

It's by far the best driving van out there. Just beware it maxes out at 7500 pounds towing capacity, although many of the commercial outdoors guide companies pull way more.

Also beware that tow ratings are based of a every seat being full, so the published rating for the T150 are higher than the T350 but the effective towing capacity of the T350 is higher when comparing the same occupant load, since it has slightly higher GCWRs due to gearing.