Okay an initial review of the TufTruck springs is that they are good to go! I have ridden around with them for a day or two now and haven't noticed a change in the ride. The rear of the truck is sitting up just a bit higher now.
For the cost VS an Airbag system these are the way to go if you don't do any crazy heavy towing. I have yet to actually test mine but I am sure I will be satisfied with the results when I do.
I didn't have a real good before picture so this one will have to do. In this picture you can see the the distance from the tire to the top of the wheel well isn't much. This is right after I got my cover.
This is after I installed the springs. Again not the best picture but you can see the difference.