Theoretical questions on a Grand Wagoneer

[lumpskie]

Just stumbled across this while looking for something, I wonder what ever became of this plan?

I don't know about that guys plan. But I can tell you that Full Size Jeeps can tow just fine. Here's a thread on it:
http://www.fsjnetwork.com/forum/viewtopic.php?f=7&t=6215&hilit=does+your+jeep+even+tow