Ok, Having the background helps us understand your design. For a gate that heavy, you will want to plant those posts (especially the one holding the gate) pretty deep. 4' should do it. Also, I have found that if I "Bell" the bottom of the hole a bit to let the concrete spread out it really helps keep the post from leaning because of the gate weight. The hinge could be handled like one of the other postings suggested, sleeve a larger piece of pipe over it and drill/tap some fittings for grease.
Yes, it is sad we have to do stuff like this. Its not that I want to have a "Mine mine mine" attitude, but people won't just cross your land, they will cut doughnuts, scatter trash and in general vandalize the property as they do it.
I have a 1/4 driveway that some neighbors use to access some of their land, no actual "easement" just being a good neighbor. Well, I come home the other day and their kids are ripping up my freshly smoothed gravel ($300 a load + time/fuel to spread) with a 4 wheeler and a dirt bike!
GRRRRRR /forums/images/graemlins/mad.gif /forums/images/graemlins/mad.gif /forums/images/graemlins/mad.gif
Sorry to ramble.... build the gate, make it stout. We'll help any way we can.