I measured the height of my rear bumper on my truck and then measured it again after I connected the TM. Adding the TM caused it to sag 5/8 inch. I found no need to use a WD hitch.
If you have a substantial sag, then that indicates, I think, that a WD hitch might be a good idea.
A better way is to weigh the front and rear axles of the TV before and after connecting the TM. There should not be very much unweighting of the front axle.
The purpose of the WD hitch is to move some weight off of the rear axle of the TV back onto the front axle of the TV. A side effect is that some weight is also shifted to the TM axle.
After adding two motorcycles to my TV, I started having more sag than I was comfortable with, a little over two inches. Since I routinely have my TM loaded to the max, shifting weight onto the TM axle is not a good idea for me. I bought a bigger truck to solve my problem.
I am willing to bet a modest amount of money that almost no one takes more stuff with them than I do.
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