If you have a problem, if no one else can help, and if you can find them, maybe you can hire... The A-Team!
During all the exhibitions next to the Ghostbusters car, most people instantaneously know the source of that van.
When the Monster Dino (4958) came out in 2007 I thought it should be possible to use the included power function elements for a remote controlled car. Sadly the part designers focus layed on Technic, so the battery box and the motors don't have any studs! Anyway it had to be a van to get enough space for all the electronic stuff. In the Legoland I've already seen a VW Bully, so my choice was the GMC Vandura with it's very well known color scheme.