Scale weights

Front 3720 (lost 100 pds?)
Rear 3780 (added 920 pds)

You are under the truck's gross weight of 8800 pounds by about 1300 pounds. That is good. But.....don't forget to add in all the weight that will be in the truck that includes people, dogs, tools, and all the stuff you will have in the back. You may be much closer to the gross weight with all that weight added.

Also, did you weigh the trailer with full propane, batteries, full water and all the supplies to go camping? If I am correct that model of Arctic Fox has a gross of 10,000 pounds and a brochure dry weight of around 6800. So you have around 1000 pounds of stuff or options already in the trailer when you weighed it. As you add trailer weight it will add to the tongue weight and reduce the payload available for your truck. Weigh it full of water and ready for camping with batteries and propane and all your stuff. You probably will be adding around 1500 pounds to the dry weight as water is 8.3 pounds per gallon and can easily add 500 or more pounds to the trailer's weight.

The heavy Cummins diesel losing 100 pounds on the front axle is probably good for the suspension and handling. I would not add any more weight to the front end. The truck is designed to carry weight in the back, not the front. Remember a weight distribution hitch also distributes some of the tongue's redistributed weight (around 20-25 percent) back to the trailer's axles, the last place most people want more weight. So, only add what is needed to get to a good place towing using the hitch's spring bars and no more. In this case more is not better. With your truck you are more interested in sway mitigation/control/elimination than weight distribution.