I.e. cars that can be bought on the west coast for cheap and sold on the east coast for profit. Prime candidates to do the cannonball run in.
See my previous post for all the details.
With that being said, I think this mercedes 300td would be a good candidate for a Cannonball run. It's comfier than my Miata, it'll hold a hell of a lot more, it's not likely to break down along the way, it won't cost an insane amount in fuel, and I think it would be an even trade for my 96 M edition.
There aren't a lot of 300TDs on the east coast, likely having all rusted out, so I think this should also make me a pretty penny if spruced up and sold as a fully sorted car.