i blew a tire sent me off the road into the mailbox. instead of breaking it off the mailbox flew against the windshield and out into a farmers field. and the car jumped up over the post. the maibox was a home made one , quarter inch steel about 1 ft tall about 18in long. it was mounted on one of those old cast iron well hand pumps (ones where you had to carry in water) ,and it was cemented in the ground. that thing didn't move. the county made the guy remove that.
so you're right kinda like a brick wall