As the owner/operator of a TTB I'll second Yeller's comments and add some.
The D50 TTB is the worst possible option. The beams on it are short, so the camber change vs. suspension movement is increased over the D44 TTB. There is no gain in strength with the D50 over the D44 because they both use the same U-Joints in the steering and mid-axle locations and these already are the weakest parts in the whole axle.
If you go with longer than stock radius arms you can get the caster change into a reasonable range.
Excepting the whole U-Joints strength issue, the rest of the system can be built to be extremely stout and it can cycle 12+ inches fairly easily. Some COTS TTB Systems are strapped
down to 16"! There are good reasons to limit the droop of this system, if 16" of wheel travel isn't enough....
Two of those COTS options:
Option 1 Option 2 Then there is the orinator of TTB suspension tech:
https://autofab.com/category/suspension ... uspension/ No, they're not inexpensive, and yes some probably can build their own for a lot less. However there are a lot of nuances to building a strong TTB, what to do about that middle U-J is just one of them.
I have been outright abusive on a couple occasions chasing broken desert racers and once just trying to find a speed on Saline Valley Rd. that wasn't rattling my teeth out (nowhere between 1mph and 60mph was smooth!). No problems beyond normal wear and tear.