We towed the M21 fully loaded with a Toyota 4Runner, 4.0L V6, around Texas with no problem (rated at 5,000 pounds towing capacity). However, for extended trips involving mountains, we wanted something more substantial, so we upgraded to a V8 4.6L Toyota Tundra (towing capacity 8,600 pounds). I can also add that while the 4Runner could get the M21 up and moving pretty briskly, be SERIOUSLY heads-up about STOPPING. The first time you slide through a red light with all eight tires smoking, it'll really get your attention...
;P