I am building a working chute that leads to just a headgate (no squeeze), I put 2 4x6 (3.5 feet deep) posts at the end to mount the head gate, and 4x4s behind those to hold the panels up. I plan to brace the 4x6s about 5 feet up back to the bottom of the 4x4s with 2x4s. Will this be strong enough? Most of the headgates I have seen have been mounted to metal pipes. We have an angus bull and cross bred cows. Thanks for any help.