I think we answered the Gen-Y Hitch question. Whatever problem that thing was designed to solve, doesn't really exist on a travel trailer. So, the cost and weight that it adds is unnecessary. Stick with a standard WDH (Equal-I-Zer 4-pt, Blue Ox, etc.).
Now on to the math. Here is the specified trailer floorplan:
Because this is a bunkhouse with a rear "bedroom" area, I'll assume that there at least 2 kids in play, plus a full set of parents. Fully clothed, mom and dad tip in at 350 and the two kids tip in at 200 combined. That's ~550 lbs of human being.
Add 50 lbs of "stuff" that gets brought into the truck in the way of gear, bags, electronics, and so on. Add 50 lbs for the WDH. Add another 150 lbs for stuff in your truck bed: bikes, firewood, tools, toys, and other items. If you have added Line-X, a topper, or any other accessories, you'll have to count those, too.
But, figure right around 600 - 900 lbs for a family of 4 and all their gear. I think my numbers above total to around 800 lbs. I'll drop 50 lbs off that and use 750 lbs.
You have a payload of 1846 lbs. 1,846 - 750 = 1,100 lbs. That's what you have left for a trailer.
Assume a properly loaded trailer drops around 12.5% of its weight onto your hitch. So, a fully loaded trailer needs to weigh at or less than 1100/.125 = 8,800 lbs.
The trailer you specified has a fictional dry weight of about 7,000 lbs. Add to that 1,500 lbs for factory options, dealer options, batteries, cookware, food, clothes, bedding, toys, TVs and electronics, DIY upgrades, and everything else in or on that trailer. So, going down the road, expect that to weigh in at about 8,500 lbs.
8,500 lbs < 8,800 lbs. Quick numbers work out. It's close. If you're a family of 5 instead of the 4 I assumed, it makes a difference. If you're a 6'6" 325 lb former left tackle for the Alabama Crimson Tide, then it makes a difference. If you're dropping in a 900 lb quad in your truck's bed, it makes a difference. And, so on.
The math is pretty simple, really. Take inventory of what you're packing and who's in the truck. Done and done.