Good point LS, loading those pigs up! Our first feeder pigs were in the garden all winter, we just backed the trailer in and fed them in it for a week. They loaded themselves. The second batch of feeder pigs, we shot and slaughtered them ourselves. Easy to load in small vacuum sealed packages. LOL LOL LOL The third ones, we made a small holding pen, lured them in and didn't feed them for a day. DH backed the trailer up, we used cow panels to make a loading chute and put smelly soured corn in the trailer. They loaded themselves.
Point being, put up a wide gate that you can drive a tractor through. Make sure it is accessible to a trailer. Since you will be going through the goat pasture to get to the pig pen, you will want a holding pen or small lot where you can close the goats up to keep them out of the way.