 When taking off from a full stop, there is a noticeable "thump" in this truck.  Its almost like the rear end is going to fall out.  Internet searches show other Frontier owners have reported the same problem.  Internet forums say its axle warp and that a helper spring can fix the condition.  Dealer service dept says nothing is wrong.  Tired of bringing it back and having nothing done.  Arm rest is too short too.  Not a good experience with this truck.  Had it two months and will be getting rid of it very soon via trade for a more dependable vehicle.  