Size the WD hitch to handle the heaviest trailer your tow vehicle can tow without being overloaded. If that's 5,000 pounds trailer, then use 15% of that 5,000 pounds for the max tongue weight of the trailer, or 750 pounds.
However, your TT has GVWR of Less than 4,000 pounds, so max tongue weight around 600 pounds. So a WD hitch rated 600 or 800 pounds would be better as long as you don't upgrade to a heavier trailer.
So you need a WD hitch with at least 600 pounds tongue weight capacity, 800 pounds gives you a little more margin, and 1,000 pounds is probably too much hitch for your current trailer, so go with a hitch rated for either 600 or 800 max tongue weight.
The Fastway hitch is the new "economy" brand by Equal-I-Zer. A real Equai-I-Zer with the same 1,000 pounds max tongue weight specs will cost an additional $94. That additional cost to get a proven brand with thousands fans is well worth it until the Fastway is on the market long enough to have lots of industry reviews.
Ignore the cheaper round bar hitches and insist on a trunnion bar design. Round bar hitches have severely restricted clearance between the bottom of the bars and the ground, so you are often dragging the hitch on the ground. The trunnion bar hitch is a different design that doesn't have that problem with ground clearance.
Here is the Fastway you referenced:
Amazon discount price for Fastway = $408.56
And here is the equivalent Equal-I-Zer:
Amazon discount price price for the same specs Equal-I-Zer = $501.80
But you don't want a WD hitch rated for 1,000 pounds tongue weight. You want 600 or 800 pounds max tongue weight rating.
Here is the Fastway 92-00-0800 Trunnion Weight Distribution Hitch. (The 0800 in the part number is the max tongue weight):
Amazon.com: Fastway 92-00-0800 Trunnion Weight Distribution Hitch: Automotive
And here is the one you need for your current trailer - Fastway 92-00-0600 Trunnion Weight Distribution Hitch:
Equal-i-zer 90000600 Equalizer Hitch is the one I would buy for your current trailer:
Amazon.com: Equal-i-zer 90000600 Equalizer Hitch: Automotive