I am surprised that nobody has not yet built a dirt race track like Eldora and made the cars to go along with it. I think that would be a really sweet mod if somebody could do it. Dirt track racing along with truck and tractor pulling is a big thing around here. So another suggestion is a pulling truck/tractor and a sled! Would be the sweetest thing i have ever seen in a game!
Well the devs are developing a new map called "West coast USA". It will feature alot of different type of tracks including a dirt oval track and dirt racetrack. Look at the first picture where it roughly shows how the map will look like.