Need A Ride?

About this car:
1. We’ve spotted it in a few places around town, so it seems to be in drivable condition…
2. … but that chain on the rear wheel might change things.
3. The decorative plate on the front says “Gardener Rosie.”
4. It’s for sale!!! Though no price is listed on the sign in the window, interested parties can call 917-450-5244.

Does anybody know the owner? Rosie seems like an appropriate name, both for a gardener and for the driver of that car. And what’s the contraption above the trunk?