I have a 100, and I use an EAZ-lift weight distribution hitch when towing my horse trailer loaded (about 5k lbs). I can't tell the trailer is there until I hit a hill. Before using it, I had about 2 or 2.5" sag on my rear axle when towing this, slightly light-feeling front end. Afterwards, I had 0.5" or less rear sag and no perceivable sag or lightness up front - the weight was spread well. This is with a stock suspension with 130k on it, no air bags or beefed-up suspension. Great!
What's more, the trailer tows much more directly, with much less wobble and wiggle - and this is hugely beneficial if you tow hores, who are back there compensating for that wiggle/shimmy.
I won't tow anything over 2.5k lbs w/o my weight hitch - it improves towing so much.
Negatives:
1) takes a little more to hook up, but once you get used to it, only about 1 minute on hook up/un hook. Very easy to use
2) it does make the trailer very twitchy to backing. You can't jack-knife it, but it is a little harder to back as it is, at first, less responsive to steering inputs, then massivley corrects because of the input of the bars.
3) terrain adjustability is compromised - but I have towed heavy loads up reasonable forest roads, gravel, etc. and it works fine. If you get into really steep angle, you do need to take off the equalizing bars or you might seriously torque the tongue or pop it. But it is adaptable to most encountered situations - just not suitable for serious angles.
email me if you want more information. But do not hesitate to buy one of these - they are well worth the cost.
Here's a pic of my rig with 5,000lbs (very high center of gravity, also - w/horses standing the cg of that trailer is about shoulder-high to the diriver/passenger on the LC). Sitting level with stock suspension. 2nd photo - we had just towed up and down this mountain on forest/gravel roads smoothly and without a problem (we do this routinely).
1) the rig
2) the mountain we'd just gone up/down