I just got this truck the other day and on my way home after a 4 hour drive I was about 10 miles from my house and hit some train tracks at 75 mph with the cruise on. All of a sudden the whole truck started violently shaking and the steering wheel was bouncing like crazy. I jammed on the brakes and got into a turn lane and got out to eye my tires to see if they were both at least pointing straight with the wheel being straight and they are. It's a 05 2500 standard cab long bed with I think like a 3 inch lift but has stock rims n tires on it now. I lifted the truck n checked my front end and everything is tight. I had a 06 quad cab with 38.5's and never had this happen before. It has happened to me 2 times now and the second time I was going a lot slower and didn't even hit any big bumps. Is the factory steering stabilizer not enough for these trucks? Anybody know what I should do? Also I'm hoping I can ask this and not get slammed with a bunch of replies that are no help. The truck has a edge box under the hood and a 3 position switch. I was checking out the under hood stuff n noticed 2 wires tapped into the harness of the edge box right before the map sensor wires D and C the red n tan wires. So I know it's a smoke switch and it wasn't hooked up so I ran the edge switch in the truck n decided to put the smoke switch in next to it just for fun maybe sometime in the future. After I installed the switch I was checking to see what way was on n off and it set a check eng light for over boost. So I cleared the code and tried it again n same thing. I thought with the edge box it also fooled the computer so it didn't set an over boost code. I only turned it on for about 5 sec and then it sets a light. Any idea why that would be happening? Thanks for any help.