I've done the trip, and yes... pulling a boat. It wasn't worth the expense, danger and harassment. It took us about 6 days to get thru Mexico, and we kissed the ground when we got to Belize. By the time we got to Belize I thought I was going to have a stroke. I would never ever ever ever ever do that again. Also, you can't leave Belize unless you take the boat out, or pay the duty. If you use the search feature in this forum you can find others who have done this. But for me, and I think Sanshaker will agree (she drove thru Mexico), it can become a disasterous trip, you become a target.