Square Truss

I am erecting a drive way entry. It is 14′ high and 16′ wide, weight is about 700 Lbs. how deep are the holes.?
This is a single truss system made up of 6X8 fir with 14′ posts supporting the truss. I need to know how deep the holes for the post should be. The truss company is making a steel base plate for each post, the plates are 17″ square with a 6X8 post support, the posts are to penetrate through the plate and get contreted into the ground, each plate will have four, 3/4″ allthreads that also penetrate the concrete. I need to know how deep the make the holes so I can add the extra feet to the length of the posts.
Six feet if its going to be free standing,preferably set in concrete.
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