Wood Chip,
I picked up my trailer this last weekend. It is an Eclipse Attitude 28SAG w/slide and here are the manufacturer specs
Dry Weight - 8900lb
Pin Weight - 2035lb
GVWR - 11,900lb
With the trailer hooked up my truck squatted 2.25" in the rear. Trailer towed really well and didn't feel like I "need" anything to assist the rear suspension. That was empty however... I will be loading the trailer up for a trip this upcoming weekend and suspect I will be closer to the GVWR and will get another measurement to see how much squat I get. All loaded up may be a different story.