The weight of the pigs + water seems like it would need to be built pretty strong or it will break hitting the inevitable
roots, ruts, rocks, etc. Why not expand the electric fence to include the new area then move the pool, shed, etc. then move the fence to shut off the old area? An ATV could drag it if you didn't want to, easy to "sneak" one in while they're eating.
Sepp Holzer moves his pigs by training them to follow the
bucket of
feed. Trust me, it works best if they haven't been fed recently! But that's mostly what I do, let them out and get them to follow the bucket to the new paddock. 80% of the time it goes without a hitch, other times it's more of an adventure.