I guess my posting would be irrelevant at this point. For the record, I tow my 2720 with a 1999 4Runner with 33" tires, 3.5" lift springs, air lift bags and no WDH. Needless to say I do not agree with the comments against the idea of lift bags in this thread. Some will argue that without a WDH, you are unloading the front end too much. Depends on the vehicle setup IMO. A half ton chevy truck might need a WDH but the one ton version won't yet it's the same 500 lbs sitting on the back of the truck. Think about that...
Feel free to read up on the mods on my web site for info on the bags.
http://www.larsdennert.com/4runner