I see this at work a lot, but I park about a foot short of the curb. I've been on the other side of this when I was younger. I mowed lawns for gas money when I was in high school, and people would park with their bumpers over the curb like that. I needed to cut the grass, and who knows when the car would be gone, so I'd try to get as close as possible. Often rubbing the bumper. Fortunately for me, cars and trucks all had chrome bumpers back then. So nothing was ever damaged. But I've always been aware of parking near grass all of my adult life because of it. If you can't fit in the spot without hanging your bumper over the grass, then the spot is too small for a truck IMHO.