I think the manufacturers view is this: When you put 900#s of tongue weight on the ball of a TV, the rear axle drops as weight is increased because of THAT tongue weight. That is their justification for saying that the tongue weight "gets carried on the rear axle."
We could think of the rear axle as "replacing" the tongue jack and the receiver as "extending" the tongue. The WD system now distributes or transfers the weight/load on the rear axle to the front axle and the trailers axles.
Again from Equal-i-zer: With ordinary ball-type hitches, most of the trailer tongue-weight gets carried on the back axle of the tow vehicle, often this raises the front end of the vehicle. The Equal-i-zer transfers the trailer's tongue-weight evenly to all the axles of the tow vehicle.
It would not sound right if they said: With ordinary ball-type hitches, most of the trailer's reaction gets relocated and is carried on the back axle of the tow vehicle, often this raises the front end of the vehicle. The Equal-i-zer transfers the trailer's relocted reaction evenly to all the axles of the tow vehicle.
