I bought a 2015 reg cab, long box 4 wd over a month ago. TRUCK RIDES EXTREMELY ROUGH. rougher than any other 3/4 ton truck i have driven! I Past the recommended break in so starting to pull a small enclosed trailer around 3000 lb. I can't believe how squirrely the steering is on rougher roads with the trailer. I never felt that with my 2002 chev 2500hd with same trailer.