[rickst29]

Adding a WDH creates torque forces, which become counter-balanced in 3 ways:

#1, Weight is reduced at the rear axle of the Tow Vehicle (it has the shortest "moment arm" from the hitch), raising the axle height. Since this is the one which most easily becomes overweight in loading the TM and Trailer for a trip (and hooking them up), WDH is probably your friend.

#2, Weight is increased at the front axle of the Tow Vehicle - which is probably desirable, for purposes of control and braking. YMMV (a little bit).

#3, Weight is increased at the TM axle - which is undesirable, especially if you only have the 3500 lb axle.

If you find that your LOADED axle weights aren't "well balanced" at the CAT scale (i.e., equally far from "axle maximum rating" on a percentage basis), you can increase or decrease the number of chain links in your WDH to create better balance: If the TM axle is "heavy", but the rear TV axle is "light" - use less chain tension. If the TM axle is "lighter" and the rear TV axle is close to it's limits, tighten the WDH with more chain tension. And don't forget - whether you travel with the water tank filled is a big factor in TM total weight.