I got @##^&* at people intentially taking out my posts and those of our
neighbors.mostly joyriding kids

Kinda amazing once it was replaced with a steel beam 6 feet in the
ground it never got hit again...

I didnt concrete it in, no matter what post you use concrete makes it
hard to reset if tipped.

I was espically glad I didnt concrete it in when it had to be relocated
for a sewer project

The steel beam doesnt meet all those pesky rules, but then again there
are lots of fixed things that you dont want to hit. like utility poles.

another neighbor set some HUGE rocks around their mailbox post as
landscape materials.

soounds like your post will be well back from the road a definite
positive