One suggestion.... make your gates 16 footers.... you never know when you need to get through one with a truck, tractor, trailer.... whatever.... If it is snowy you need leeway, if it is muddy, you need leeway.... put 2, 8 footers if you want, but believe me.... having to put in a bigger gate is a royal PITA......Ask anyone on here that has put in 8 or 10 or 12 ft gates and they will all tell you that they wish they had put in a bigger gate....
On top of that, if you need to get a neighbors equipment in to say, use a discbine to cut hay, or a tractor, baler , wagon combination, there is room for them. Most drills that you rent from even a co-op, need a minimum 10 or 12 foot gate to squeeze through. I have a little Farmall H and the one place has 10 ft and 12 ft gates from field to field... and it is a real jockeying to get a pull behind side delivery rake through them.... The rake is offset, and I have to go through 2 of the gates at a certain angle and then swing the tractor around so it pulls the rake through at an angle to get it between the posts.
12 foot may be wide enough, but with little wiggle room.... believe me it is a pain to have to barely "crawl through" with the equipment touching the sides of the posts.
