One more thing to keep in mind. Comparisons between vehicles should include the type of structure they are built on. The Sienna is a unibody vehicle. The Tacoma is a body on frame truck. I would think the way a hitch is attached to the vehicle would make some difference. A ladder frame in a truck distributes the hitch "pull" along the strongest part of the frame. The mounting points for a hitch on unibody vehicle may not be built in the strongest part of the structure, nor has the same thickness of metal as a frame rail. The additional rails attached to "shinysideup"'s hitch and run further up the structure probably attest to this point.