Honestly, for ease of use / cost, the Timbrens do a great job. Literally a 5 - 10 minute install. No need to jack it up or get dirty. It did not effect unloaded ride at all.
I have a Wildwood Xlite 273qbxl at 6100# dry (say 6,800 - 7,000# loaded) and without the Timbrens the squat and truck towing performance is rather awful, so I know they are doing their job. I also have a hellwig set to the stiffest setting.
Good luck!