I still like Tim's definition the best with one small modification.
A weight distribution system enables a tow vehicle to more effectively handle the tongue weight of a trailer by removing some of the load from the tow vehicle's rear axle and distributing it to the tow vehicle's front axle and the trailer's axle(s).
I have inserted the "some of the" in bold above. It could have been interpreted before as removing all of the load.
I would also add Thomas's last sentance When the WD system is engaged the tongue weight does not change. to the definition above. I would insert the word "actual" in front of the word "tongue"
The whole thing would then read:
A weight distribution system enables a tow vehicle to more effectively handle the tongue weight of a trailer by removing some of the load from the tow vehicle's rear axle and distributing it to the tow vehicle's front axle and the trailer's axle(s). When the WD system is engaged the actual tongue weight does not change.
Barney
