I agree with Cherie, look at some more local associations or clubs. ( I didn't even think of the Foundation associations/clubs!)
Usually there is a local or state quarter horse club that offers the same classes as AQHA at their shows you just need to pay attention to as what shows are sanctioned or not if your looking to get points.
AQHA does have ranch horses classes, but it is in the form of the Ranch horse Versatility competition. They have a ranch horse pleasure class but I not sure if they have offered much more than that outside of the ranch horse versatility yet. I think they are heading back that way since they have started a program recognizing ranch horse breeders.
I DON'T LEAD 'EM AND FEED 'EM, I RIDE 'EM AND SLIDE 'EM.