I apologize for the vagueness, I wasnt really sure what all to add.
My initial idea was to make a mobile shelter on skids I can move around when I move the pen. Feed and water will move with the shelter.
I really didnt want to fence in the entire 4 acres, thats why I was trying to figure out...
So I am getting 4 pygmy goats and am trying to figure out if its better to have a stationary pen or a mobile one I can move around in a 4 acre field to allow them to graze fresh grass. If the portable pen is ok then Im looking at fencing options. 16 foot panels with t posts vs a 4' solar...