There is a tool called a fencing tool. It looks like a large pair of pliers that the 'head' (working end) sorta looks like a hammer. Any ranch supply store in an area where they use wood fence posts will have them. Too big/heavy for backpacking distances (and unnecessary). You can pull the staples that hold the wires out of the posts with the tool. Do this to 4-6 posts, lay the wires on the ground. You can now drive over the wires in the middle. Put the wires back up and the staples back in place. Do not do this near a corner or where there are double posts about 5 feet apart with crossbrace wires, if you do, you are effecting wire tension. If you center the dropped wires over a slight rise in the ground, you have to drop wires on fewer posts. In ranch country a lot of ranch utility vehicles carry this tool for repairing fences.
This is HOW you do it. NOT casually. Not without good reason. And typically only to your own fence. What it does is function as a temporary gate. Not quick to open or close, but sometimes a gate is a LONG ways away, and stock or a vehicle need to be moved through-sometimes repeatedly over a short time.
A little knowledge CAN be a dangerous thing...
gimpy
_________________________
Good solid science needs no apology.