So the thing is there are two schools of thought... at least I think there are. One side likes to have really lightly built TD's using a single central tongue member that is long enough to put the cabin (and tongue box) past the end of the bumper if you ever have the need to do a full 90 deg jackknife to maneuver out of a tight spot.
Since most (all?) vehicles can't turn this sharply, it is a situation that would only happen when backing up and only works with a draw bar receiver hitch where the ball extends away from the TV (not a bumper mounted ball like on a P/U truck).
The tales of woe that have been posted where tongue members have failed, second xmbr bending down or tongue failing outright, have been single member tongues (as best that I can recall... which admittedly isn't saying much
While this arrangement does provide a tighter angle when backing, it doesn't really keep you from going too far and pranging something. You still have to watch your mirrors and know the limits.
The other school of thought is that an A-frame tongue is inherently much stronger and therefore better suited for rugged conditions, despite the turning limitations.
My thinking goes along this line. With the added length from my universal joint off road style coupler and draw bar, the standard 50 deg angled A-frame has more clearance than it would with just a typical ball style coupler (i.e. the pivot point is further ahead of the tip of the 'A' than it would be with a weld on ball style coupler, and further away from the TV bumper, too).
Another way to get better turning clearance with an A-frame tongue would be to copy the Australian style, reducing the angle between the 'A' members and making them extend out further from the front of the cabin, but then you won't be able to use a std, 50 deg style coupler. Adding a small spit of straight tubing to the end of an A-frame (a composite tongue) might be a way to get the best of both worlds, but you have to be careful to design properly or you can create a weak spot where the forces are concentrated at the join.
For me, it's not the end of the world if I have to uncouple, turn the jeep around, drive past the TD, turn the TD around, and couple back up again. For me, that can still be done in less width than it would take to maneuver a single tongue at 90 deg. Maybe not easier on less than flat ground, but for my intended purposes I just don't see that as being an issue frequently, even on the Magruder Road.
Something you might want to do is look up or measure the turning radius of your TV. From there you could do some simple scale sketches and paper cut outs (or more sophisticated computer modelling, if that is within your "tool box") and see what things look like with your planned axle placement and tongue configuration (including tongue box).
To be honest with you, this is not something I have done. Kind of taking it on faith that my simple measurements and planning will see me thru. I do have a little trepidation about the first time I hook to the Jeep. Will my bumper crash into the TB?