COG - I broke a cardinal rule...go easy on me

Bedlam wrote:

When the trunnions/spring bars shift the weight off the tongue, the master cylinder in the coupler cannot not be properly activated during deceleration to apply the brakes. It reduces the deceleration forces on the coupler due to the torque forces.

If the OP had electrically controlled brakes, I would also recommend a WDH. It works well on my setup and I have 1.5x the tongue weight on my SRW.

hey bedlam...I am not doubting as you have done this...just trying to understand.
The force at the coupler/hitch ball (and therefore the master cylinder) should not change as the spring bars shift as they experience their load prior to the spring bars.
The load after the spring bars will vary as the bars load/unload, this would be felt at the axles/wheels/tires/etc on the truck. IOW all the components in play after the spring bars.

This is from Progressive Mfs site (the Mfr of the Equalizer hitch;
The Equal-i-zer hitch will work with most trailers equipped with surge brakes because the spring arms rest on rigid Sway Control Brackets, rather than being suspended by chains. The bars slide forward/backward while turning or braking, without the tendency to "spring" back into the straight position like bars hung from chains do. This allows the surge brake to be properly activated, instead of intermittently activating/deactivating the brakes, or not allowing enough compression to activate the surge brakes at all.
Progressive Mfg

Perhaps this changes with the type of WD hitch/spring bars...there are several types.

Bill