I'm not sure how much my mini can pull w/o harming him. He's 36in, 225lbs (he's fairly trim, not morbidly obese). I can't find much info on towing limits.
I drive him now in a lightweight, 2 wheeled training cart. I weigh about 130, the cart about 100lbs, I think. In teh pasture, obviously,it's harder for him than on the paved road. It's not hilly around here, but I don't want to overdo it in the pasture. Would me n hubby be too much (hubby is big guy at 225).