I just got back from a 2 month trip where I travelled approx 6000 miles on dirt roads and trails. My truck (Supercrew)has these coils on mid perch with wsi hd springs in the back as well as 37 inch tires. When I first put the springs in I thought the ride was pretty good but after this trip I can say that when you hit potholes there is very little give and the ride is very harsh. This also happens on protruding rocks on the road. I had approx. 500 lbs of gear in the back. The wsi springs are awesome. The truck literally got shook apart. A lot of the aluminum items broke or cracked,all my hella driving lights broke at the mounts,door locks quit working,windows could not be left down as they would rattle and squeak,doors all started squeaking and rattling,the steering rack started making a horrendous rattling noise(truck has cooler and icon resevoir) and the resevoir would get so hot you couldn't touch it.
Also both front shocks blew their guts out and 1 actually started to come apart. The cap unscrewed itself and got hung up in the springs. All in all I am not very impressed with the truck. I could go on with all the other weird things that went on with the motor but at least the thing never quit running. I guess I shouldn't say that as the low oil pressures light would come on and the engine would shut down but restart.
Don't worry. Warranty will cover it.