Back in the early 1990's, I was summering 200 head of yearling heifers about thirty miles from home. One afternoon, I hauled salt and mineral to these heifers and was looking them over. They all strung in to eat the feed, as the bunks were empty. There were sure four head that had footrot. It was already the middle of the afternoon, and it was thirty miles back to the ranch to get horses and my hired hand to help me rope and doctor these heifers. Then it was another thirty mile trip back to where the heifers were summering. Taking inventory, I realized that there was already a bottle of LA-200 in the pickup and a good syringe. Behind the seat there were two ropes.
The heifers were all crowded around the salt bunks, so I took one rope and slipped a loop on a heifer's neck. She spooked and took off, but I moseyed back to the pickup and drove easily up behind her. I was able to get one of the front tires of the pickup over the top of the dragging rope. This held her in place so that she could only go back and forth around the pickup. I was able to get the other rope on one hind leg and tie it off to the 2 inch trailer hitch ball. I drove slowly ahead until the rope came tight and drug the heifer until she went down. Using the rope that was on her neck, I tied her hind feet together which immobilized her until I could get forty cc's of LA-200 into her.
I turned her loose and tried it on the next heifer. That worked similarily, so I did it on the other two also. The whole endeavor probably took a couple hours, and the two ropes got scuffed up pretty bad before the job was done. I was kind of proud to get the four heifers all doctored by myself, without the help of a horse.
Not sure if this is what you were looking for in an answer to your question, Jinglebob, but it was done with a "four-wheeler" (pickup, that is). :wink:

The concept of how well a rubber tire holds a rope when pressing it firmly against the ground is partly how our "calf trap" branding gizmos came about.