why dont you send one of them kids windmills out for chroming and use that?

...or how about one of those boat propellers that you stick in trailer hitch receptacles? ...its already chromed!!

with either one you would be able to tell if you have a head wind on the highway and plan your trip accordingly... cant do that with a mermaid unless you get one with free flowing hair like one of them troll dolls.

you could even use the propeller as a speedometer of sorts... then you'd be able to get rid of your dash speedo and mount the mermaid in its place with its **** facing you for cleavage cruising