to the tray or roo bar of your vehicle
Er--would you please elaborate on what parts of a vehicle both of these things are? As far as I know, the only vehicles that have trays here are limousines. Oh, there are ash trays, but in a lot of models the front is flush with the dashboard, so you couldn't really hook anything on to them. Needless to say, we don't have roo bars here.
Rhubarb, yes, and there is a lovely one in England, as well...

THANK YOU for explaining the "thunderstorm smell"! I've always wanted to know what that was caused by. I am getting more and more impressed by you, sir!