Good morning,
Was just reading the posts on your sitation and will say only that driving a vehicle from the US to Belize isn't as bad as many make out. In late July 2008, I drove a 30' motor home down while towing a Chevrolet 3/4 ton pickup. My main peeve/problem was with some of the road signs being lacking or non-existent and the darned speed bumps in the roads of Mexico which can come up unexpectedly to shake your teeth for you. Outside of this, the trip from Brownsville, Texas to Belize City, approximately 1,400 miles took two days and was much less costly than your shipping costs. I drove the Chevrolet back to the US, same route, 1,400 miles and found the highways in superior condition and traffic minimal problem. So, I recommend you do the drive and save yourself a pocket full of change. You can always find a driver to make the trip for you if you don't want to enjoy the drive.