Short answer: Buy the biggest SUV you can afford!
Long answer: Currently my TV has a 5225# towing capacity.
My TT GTWR is 3877#.
TT dryweight is 3166#.
My wife, dog, and I weigh near 500#, TV payload capacity is 1574#. Didn't get a good tongue weight, estimate about 450# based on other weights.
However, I did get good axle weights, with and without the WDH with me, wife, & dog onboard.
Base TV factory weight + payload capacity is 6180#. Without WDH TV weighs 5740, with WDH TV weighs 5920.
With just the numbers above, you can see that it initially appeared I had a good safety margin, TT 5225 tow capacity and buying a 3166# dryweight TT. I thought so. I WAS WRONG!
I bought the TT specifically so I could tow it with my current TV. It tows it adequately, not white knuckle but not that great.