The hitch weight jumps as soon as you start loading the camper up. A bunkhouse at almost 37' long- I'm assuming that you'll pack a fair amount into it. I also see a different dry weight number on the Coachmen site (specs here
) - it shows 7,374 lbs.
The dry tongue to dry weight percentage is 11.4%. Once you load up the front pass through storage, add propane tanks and battery - you're likely look at 12.5%-13% which is right about where you want to be with a travel trailer.
Guessing that you'll put 1,500 pounds into the camper between options that are added with the factory order, propane and your personal effects - that gives you a loaded weight around 8,800 pounds. That means you'll have a tongue weight as low as 1,000 pounds and as heavy as 1,150 pounds. Given your previous numbers (scaled weight of 5,980 pounds and a GVWR of 7,200 pounds), that is going to put you right at the maximum of your truck *if* that scaled weight included the truck ready to camp (all passengers, all stuff).
Not to mention that 37' behind a 150 seems like an awful lot.
What is your hitch limited to for tongue weight with a WDH?