Mine was dropping about 35mm with the van, installed a load levelling hitch for a 3500km highway trip and it worked great. When I wanted to go off road though the hitch was no good. Installed the bags and drops about 10mm with them at 30PSI. Handling is pretty good too, not as good as with the LLH but a lot better than with nothing.
Haven't weighed the ball weight officially, but the label on the van states it as 159kg dry and max 180 (the brochure stated 120kg..) With a full water tank I am guessing around 130kg but will find out shortly as I now have it in the new shed so have a nice level and hard floor to measure it on.