You should take the guesswork out of it. Take your suv to a cat scale all loaded with people and all the gear you would normally pack for a trip. Deduct that weight amount from the gross weight rating and see how much tongue weight you can hang off your hitch. Don't forget you will using a WD hitch @ approx 70# depending on model, adds to the hitch weight.
SUV usage is limited by it's payload capacity and getting a true real weight is important because you need it as a starting point.
As an example, my Jayco advertised dry TW is 455#. All loaded up and rolling down the road i'm in the 950# range as per my Sherline scale.
Will your suv be able to handle that much weight without exceeding your GVWR and your hitch rating . My trailer is at 27 ft with no slide and no bunks. Im about 6200-6300 # . My TT is aluminum not filon which adds about 800# of weight, maybe more, filon is heavy .
