Scott54
Tough one.? You could mix the truck and buggy class, mix the truggies and the 1/8th. Thats really all you can do there. Try it and see what happens. The worst case is go back to how they sign up.
If we are short at our track they just announce they are mixing classes and to look at the sheet. No one ever really gets upset.
We usually get 5 0r six classes. And it takes about 5 to 6 hours to run them.