what about splitting some of the so called big races into regionals to cover that area. Make four regions, two major regionals per year and then a nationals.
Limit it to three sedan classes and three pan cars nation wide
13.5 foam sedan
mod sedan
VTA racing or 17.5 rubber
1/12th scale
17.5 1/12th
mod 1/12th
200mm 1/10th pan car
13.5 spec tire