The 2020 Supra SE550 is a heavy girl!

[Isaguel]

This is what I get out of this thread:

Ford hitches don't match the tow rating of the truck so you have to use a weight distributing hitch but weight distributing hitches don't work with boat trailers so you have to use your Ford without a weight distributing hitch which means you can't use your Ford to tow most modern wekeboats unless you remove the stock hitch and upgrade.

Did I summarize correctly?

You almost have it right. The factory hitch is rated for the full 13200lbs, even without the WDH. What the WDH does is distribute some downforce onto the front axle to prevent loss of traction from front tires and possible loss of control of vehicle. That is the problem, not hitch failure. The truck is like a teeter totter with the fulcrum at the rear axle. Too much downforce on the hitch lifts the front of truck, hence losing traction at the front wheels. The WDH DOES NOT remove weight from the hitch, that is impossible since it does not attach anywhere on the frame. It uses torsion bars to produce a torque that keeps the hitch and truck level, under enormous tension, if installed correctly, hence distributing weight along the truck, but downforce on hitch is the same. Adding a more heavy duty hitch will do nothing unless you somehow attach it forward on the truck frame, meaning in front of rear axle, which is not possible.
Moral of story, since we cannot use a WDH because of the design of our trailers, when driving, be mindfull of road conditions, wet roads, rain, you can lose traction with a sharper turn or evasive maneuver, or hydroplane easier.

A larger truck like a F350 or a larger diesel GMC 3500 will be much better because its a heavier truck, much more weight up front from much heavier engine and tranny compared to the smaller lighter block of a v6 on a F150 ecoboost, or even the smaller 2.5 ltr ecoboost.
There is also the issue of uneven wear of tires, brakes, brake discs, rear axle and other components in the rear due to the uneven weight. It is dangerous if one is not cognizant of this issue. I drove 1.5 hrs in the rain on sunday night anfter a day in the lake and was going no faster than 55-60. Wife gets anxie until I explain the whole WDH and hitch/trailering issue. THen she was OK.