just noticed this in the D4 era manual (acutally rrs but i imagine its there too)
on another note, i found a weight distribution hitch works for me to shift about 80kg off the rear axleQuote:
Nose weight must be the greater of 50 kg or 7%
of the actual trailer laden weight, up to the
maximum tow hitch load. Nose weight can be
measured using a proprietary brand of nose
weight indicator.
taking car spare tyre off takes appx 35kg off the rear axle
taking the gonads off takes appx 47kg off the rear axle
about 50% of the weight added to the rear bar of my 23ft caravan is removed from the ball weight of the van
also i saw a video on yt that demonstrated that when self leveling suspension pumps up to level, it actually puts more weight on the rear axle than with the sag, so air bags (even the manual ones added inside coil springs) just make the car level, at the cost of rear axle load, but WDH helps both.

