Forest River quality tends to be fairly typical, middle of the road for the industry. Which means cheap, thin materials and slapdash work as they crank 'em out as fast as possible. But I would buy FR before, say, Thor stuff. If the floorplan and price were right.
But hitch weight will be too much on that TT. You do not want to have the receiver break at highway speed and send the TT careening into oncoming traffic. Plus I would not tow a TT that long with ANY tow vehicle without a Hensley Arrow or ProPride hitch, and I do think highly of Equal-i-zer hitches & have used them.