Doug,
After getting my Garmin StreetPilot C340, I immediately bought 2 more things...
1) The Garmin dash mount...even though my 2001 Jeep Cherokee Sport doesn't have what you would call a "full" or "flat" dash, it rides well. There are no marks left after removal..just lift off & put it away.
2) A video camera case (purposely NOT a Garmin or GPS case). It holds the Garmin & ALL accessories & doesn't give away the brand name or what it is. I put the cased GPS on the vehicle floor, covered by a folded dark blue (matches MY Jeep floor color) cheapie fleece blanket that I always keep in the Jeep. I also case it BEFORE I stop & park.
Mike