After posting I realized that a fixed tongue would make it rather difficult to hook the hitch to the tow vehicle, so a pivot point behind the hitch needs to be there.
There is about 45* of up/down pivot with a hitch on a ball(about 15* movement down and about 30* of movement up, would this be enough to cycle the suspension of a towed vehicle just as with a tandem axle trailer, if the tow bar was designed to pivot to attach to the toe rig but then pinned to make the tow bar solid?
Rather than make another post I will correct myself here.
I understand now that it wont, that the relatively short length of the tow bar in relation to the location of the front axle of the towed rig would have the solid bar constantly lifting/puling down the front of the towed vehicle as both vehicle cycled their suspensions during movement. It is clear that the tow bar couldn't handle this amount of movement, nor the mounts, and it is necessary for it to be able to constantly pivot.
