Simpler description: CarWoo (YC S09) for used cars. This is their business model, and there's certainly an opportunity to do the same with used cars. You should probably find out what dealers are paying CarWoo -- they'll likely move into the used car space too eventually.
All I see at unloadyourcar.com is a GoDaddy parking page.
This is actually what AutoRef.com, the startup I'm working with does. While it is similar to CarWoo for used cars, interacting with dealerships about specific vehicles tied to a VIN number is quite complex.
It's easier with new cars than old cars because you have an apples to apples comparison. The problem I had with using carwoo is that even after negotiating the price down, showing up at the dealership they tried to add in all these extra bullshit costs.
I think carwoo operates by users paying a fee like $200 or so, and is free to dealers. Dealerships treat it as a source for qualified buyers. carwoo also gives you some basic reviews of the different dealerships and car pricing info based on your inputs.
Can't say I know the first thing about the current automotive startup scene (well besides the ride sharing scene which I guess competes in a disruptive way), so perhaps dangrossman has a point in that for someone in the know the comparison could explain it.
All I see at unloadyourcar.com is a GoDaddy parking page.