I actually got the 3500 because of the width! I have an 8 ft wide flatbed, which is almost wide enough to handle 2 rows of hay bales with very little overhang. I routinely put 50 to 60 bales on the bed (about 4500 to 5500 lbs depending on the bales). The extra track width makes it a bit more stable with that load stacked way up there...
-cj
-cj