Any farm fencing company that is worth their salt (should) know how to plant a corner/gate post that will not move or sag a gate, even a 16 footer, without cables. I like the stub in the ground at the open side that allows you to swing the gate open with a latch catching and holding it, same with closing. If the gate only needs to swing one way then a post stop at the closed position gives strength/security.
Huge difference between 16' metal and wood's weight requirements with gates.
Fairly easy with tubular metal ranch gate, not so much with solid wood gates.
