[MudDog]

I have a 2002 Sienna and am towing a 2009 2619 TM.

I have both a WDH and Airlift Bags.

I went with the WDH hitch when I bought the TM. With just the WDH, I usually went 5 links on the spring bars to even out the load on the Sienna.

I added Air-Lift bags a couple of months ago in addition to the WDH. With the addition of the bags, I can go to 4 links without sag on the Sienna. With the bags and WDH at 4 links, the ride is better and there's less stress and groaning from the spring bars on turns.

I agree with Dave, on a TV like a Sienna, the bags are not a substitute for a WDH. The WDH is doing the majority of the work - the bags are just making the ride a little more comfortable and taking a bit of stress off the spring bars.

Bags alone are just forcing the rear of the TV up, rather than distributing the weight across the TV. On some vehicles that may be fine, but on the Sienna I'd invest in the WDH.