When my parents built their house in 1956 the plumbing contractor used a Jeep with a trencher on the back and a winch on the front to run the water line up a very steep hill through the woods. For years afterward one could still see the damaged bark on the red oak where they wrapped the winch cable around it.
My '64 might have had a trencher on it before I got it. It had extensive fatigue cracks all over the rear crossmember and the back portions of the frame rail. There was something heavy bolted on there.
Jeep television commercials and magazine ads of the '50s and 60's often featured pictures of a Jeep with a trencher or snow plow or winch being used. I think I can recall magazine pictures of a flatfender pulling a plow through a field. But I may be hallucinating.
I read a book while sitting in the dealership. I think it was the jeep bible it had a chapter about trenchers, backhoes, post augers and other farm type equipment added by dealerships to jeeps. If I remember correctly there was even a copy of an invoice showing the optional equipment
When I drove into anchorage a few weeks ago, I saw a CJ5 from a fence company alongside the highway with a post hole digger just a chugging away! They had the windshield completely off and obviously trailered it from site to site. Good to see some old workhorses still earning their keep!
A friend of mine has one in his junkyard. No motor or trans and the trencher chain was removed and put on another. Supposly the twin to this one is still being used today by the farmer that bought both of them new.