Any SLR camera might have issues getting down to the 640x480 pixel size most sites require. I wouldn't want to lug a SLR around myself (and I have carried 40lbs of Canon 1D bodies with the big white lenses around Antarctica, so one body and a small lens is nothing) jumping in and out of cars. We use whatever the just-under $200 Canon Point and Shoot with Image Stabilization there is. I just want a Macro feature, a built-in flash, and up to 400 ISO and I need nothing more for shooting cars around the dealership.
At 640x480 there is not enough of a difference in the image quality to justify a Digital SLR on a dealership lot.
When I'm out shooting stuff like this:
Axspot Photography - Images of Alex Snyder then I thumb my nose at a point and shoot (I posted that link of my photography site just to show that I know what I'm talking about on this topic).
This is where you buy your camera:
B&H Photo Video | Digital Cameras, Camcorders
P.S. Yes, when it comes to photography, I'm a cocky bastard