Originally Posted by JohnWedell
snip.....However on a CAT scale the trailer took 460 lbs off the front axle and placed it on the rear axle. So does the WDH now have to lift the weight that is on the rear axle (2,260 lbs)......snip
The main design function of a WDH is to return the TV's front suspension integrity back to it's "unhitched" condition ......., ideally this means returning the 460lbs back to the front of your TV. I attempt to get a WDH return weight adjustment plus/minus 50lbs of target return weight if possible (many variables come into play..., suspension, etc.).
The WDH not only removes/distributes weight off the rear axle, it also supports some weight as well....., especially TV cargo weight placed behind the TV rear axle. During the WDH adjustment process, there is some incremental weight removed from the TV's axle and distributed back to the TT axles as well.
When a TV/TT combination is traveling down a highway physics comes into play, the weight placed on a TV's front suspension will fluctuate under different towing conditions. If one is starting out of the gate 460lbs "light" on the front suspension this only amplifies the negative effect on TV handling under less then ideal towing conditions.
Once the WDH is adjusted to meet the TV's front suspension requirements the TV's degree of rear squat is-what-it-is......, after proper WDH adjustment a TV rear squat of 1" to 2" is normal for most trucks/SUV's.
Most vehicle Owners Manuals Towing Section don't refer to "weight" return, they reference TV front wheel well "measurement" return. Some will specify a 100% wheel well measurement return, some will state a % of the height delta (unhitched to hitched).