Oddly enough, we're about to meet up with our real estate agent to see some more houses today.
If I were selling a house, I don't think I'd care what you drove as long as you were professional and got the job done. And the buyers won't see you, since you'll be showing up before them anyway, right?
As for taking realtors seriously, it's interesting to see the different styles of realtors out there. Some give you a complete guided tour, some leave you alone as you walk through the house, and the annoying ones follow you and try to make conversation while you're trying to take it all in.