New Truck = Bigger Receiver = Unexpected Problem

Highway 4x4 wrote:
Just because the rear springs can take the weight and there is no rear sag it does not mean that the front is not getting lighter. It might not be enough to matter but it is happening.

Of course it's getting lighter. Any time weight is loaded behind the rear axle, the front axle will lose weight. Same with weight loaded in front of the front axle, the rear will lose weight. It's physics: principle of the lever and fulcrum.