A few other items I'll add;
Try to get enclosed underbelly and heated tank pads. That far north they will extend your season quite a bit.
If you will be travelling very far with that truck, add a tranny cooler and brake controller.
As general items to consider
Everything in the truck beyond a full tank of fuel and yourself, count against the payload capacity. Add for your wife and any other passengers, gear in the bed, a 100lb weight distributing hitch and the trailer tongue.
Trailer tongue should be roughly 15% of total trailer weight so 6000 lb trailer will have a 900 lb tongue weight. They will look lighter in manufacturers literature but those weights are without Propane, batteries and even the power tongue jack. The 15% is real world.
Happy motorin