Since the trucks we drive are heavier, the mph is a bit lower than NHRA per NADM...... ( a functional parachute system is mandatory on any vehicle that exceeds 140mph )
I haven't studied the NADM rule book and I'm really just trying to help answer question when they aren't around. The info I gave you yesterday I did get from Ron. There may be other reasoning but, those I mention seemed pretty solid. I don't know what everyone is running out there as far as mph but, the speeds are very fast for 5000lbs. and all they have is your safety in mind.
Since pro street fields are typically small anyway, NADM has been nice enough to let the racers make a decision on how they'd like to race and with what. It's not a Dodge thing and it just may be that there's less Dodge trucks on the west coast that run pro street