Thanks all for their replies guys.
I figure the 10 foot gate should only be around 200 lbs or so f I did my math correctly. I talked to the homeowner and she said the hinge post will be close enough to the house that I can add top support which will go a long way for strength.
My local steel supplier sells a 24ft 4" x 4" post .250 wall for $182. They don't sell drops anymore. Does that price sound average?
I have a small gas posthole digger with a 8" auger but no way to bore a 12" or larger hole without farming that part out or just use manual labor. This person says do it as economicaly as possible but some corners you just can't cut and do it properly. I feel this way. If she wants a Mickey Mouse job.......
she needs to call Mickey. She still has to make up her mind. I checked with two local fence companies and for a 10ft single gate, nice but not super ornate and two posts set.........$3800-$5500. She seems to think it can be
done for around $1200-$1500. I have a 10ft farm gate I'll sell her for $50.