You are referring to a sway control type device? I don't and haven't felt the need. As you know the TM just doesn't sway much. The FJC has an even shorter overhang and is likely less needy for sway or weight dist control. Much of that depends on the springs though. Toyota's are setup up with soft coils for better off road performance. I think the FJC is a bit wider wheelbase too than my 4R. Imagine the big HDT tractor trailers. They have a pretty short wheelbase on the tractor compared to the trailer. I think there must be more to the wheelbase arguement. Some vehicles are just made for towing and others not so much.
For instance you have a very compact truck but it has a proper frame, a motor that's basically Chevy's V8 350cuin truck motor with two cylinders removed so it's big on torque and durability along with (likely) a 700R4 truck tranny. It has the running gear of some full size Chevy trucks.
My 4Runner is also quite heavy which probably plays into it too. The TM can't push it around quite as much.
I think the biggest danger in towing, and you'll probably agree, is stopping ability. It's seldom addressed but adequate brakes are so important.
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