I went camping with my wife over Saturday night and Sunday. We went to Castle Rock Campground, in central UT, which is a 180-mile round trip to a small campground with 20 spots that each have a picnic table. There is one rest room in the campground with running water, but otherwise no hookups of any kind, and no dump station. The loop road in the campground is tight with lots of trees. It is way too small to fit a fifth wheel camper in there. The pickup camper worked perfect for this, and we towed a 7x14 utility trailer with our 50" wide UTV on it. We did some exploring of nearby 50" wide ATV trails. The main trail was still blocked by snow at the top of the mountain, but we were able to access everything else we wanted to. One water crossing was badly washed out. There was a line of UTVs and ATVs coming back down the canyon that we pulled over and let by. They told us the road was impassable because of a washout. We continued on and managed to get through anyway, barely. All in all, a great weekend away.
The lower Stableloads do help with squat, and with them installed the rear of the truck rides 1 1/4" higher when loaded than it did stock. The suspension doesn't feel as squishy and soft, and handling is a little better. In my opinion they don't seem to do much of anything with decreasing sway. When driving slowly out of a gas station and crossing a gutter at an angle the truck will still sway back and forth about six times before stopping.
Do they help? Yes.
Do they fix 90% of handling problems like their web page claims? No. More like a 30% improvement