Ours also towed extremely well unloaded, during the 1 1/2 hour drive home from the dealer. She tracked straight as an arrow whether at speed on the freeway or on county two lanes, even when large semis were blowing by.
The front storage trunk has a label on the door, limiting the amount of weight to be stowed there to 150 pounds. I weighed each item I'll be putting in there individually (used a bathroom scale with me and the item on it, then deducted my weight), and I'm coming in at 140 pounds. The front is lightened a little with the items we have stowed in the rear dinette storage...but not that much because the majority of the fulcrum is in front of the axle. To add a bit more to the rear of the fulcrum, I will stow my EZ Up canopy inside the camper, positioned so that more of it is behind the axle than in front. That gets my tongue weight right about where I need it.
I'm going to take the loaded camper out for a test drive this weekend, in preparation for the 5 hour drive for the Labor Day weekend.
I'm not sure any of that helps, but there it is.