Just a thought but what about a V8 truck class based upon stock rules.
When we were first putting the truck class together, this was the first route i looked at. First thought was full sized trucks, but they are so heavy that they would be painfully slow. The next thought was v8s in small trucks (s10s, rangers, etc) but the problem is with the additional front end weight, you have to add a ton of rear weight to get them to hook up, and that slows them down. Italso doubles the cost of building one because not only do you need to buy a truck, you need to buy and rebuild an engine. Next thought was v6s. The problem with the v6s is that the 4.3 liter chevy motor is the dominant setup. We wanted diversity. They also arent any faster than the 4 cylinders, for the same reason the v8s arent. With the 4 cylinder option, any make and model can win. We have had early s10s win, late s10s, early rangers, late rangers, toyota, mazda, and even dodge dakota has won.