Thanks for all the response. The truck sits perfectly level when unloaded. It came from the factory like this, I did nothing to the truck to level the truck. So when hooked up it drops an inch and causes the lights to be off. I don't think I have ever seen a truck that didn't squat to some degree when a load is applied. How rough would that unloaded ride be if the suspension was that stiff. If I try to adjust the hitch to fix the lights, I would have to set it so the truck literally didn't move in the back. I'm not sure that is even possible, plus it would be way out of the hitch manufactured measurements. I love the hitch and not going to replace it when I believe it is a truck issue. I am in the process of rethinking air bags ($), or using a screwdriver and making an adjustment (free). I don't drive the truck very often without the trailer so it wouldn't have to be changed back.
