I was beginning to think I had imagined this.
In the 1960's I saw a brief article about a 'Walker Truck' being developed by the army for use on rough terrain. The article went on to say the beastie could be mastered after "A few hours training" and was doing well in field trials.
I think I must have been the only person in the Texas Panhandle who read that article. No one else knew what I was talking about and I couldn't find the article again. Tonight on a whim I googled Prototype US Army Walking Truck and there it was!
The beastie was built by GE. The good news is that the engineers got it to work after fashion. The bad news is the description of training and handling was a bit exaggerated.