I have a ~40-45 square garden, which I till with a 4 foot tiller on my tractor. Using 7' plastic deer fencing I just take one end down and till toward the opened end. Yes, I back up to the closed end. Annually, I change ends to open. My fence is attached with heavy duty ~15" zip ties. Using a kinife to release the catch they are reusable. It takes ~ 10-15 minutes to remove from the posts. My 2 gates, just deer fencing attached to a 2X2 at the open end, are ~5-6 feet wide. My fence posts are treated stockade fence cross pieces. I use 1 per corner, one in the middle of those sides without gates and and extra one at the gate opening to attach the 2X2. The gates are on opposed sides as a drive through path.
I do have to remove the gate posts on the open end unless I want to dodge the posts when tilling. I dodge ususally only when breaking ground for a 2nd crop.