It is definately the chassis and the motor. Check 2003 Ford Vans. This is a full size van. I have a E-150 (1/2 ton) with a 5.4L and it is rated for 6500 lbs. The E-250 (3/4 ton) with the same 5.4L, but that weighs more can tow 7300 lbs. The E-350 (1 ton) with the same 5.4L, but again heavier can only tow 6300 lbs. On mine the limiting factor is the chassis. On the E-350, I would say the limiting factor is the engine. Who know on the E-250.
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