it's about weight verse HP when your sled pulling and other 4X4 sports..
for instance,Maddog was beaten by a 900rwhp Duramax(BoggieMax)and Maddog has almost 1500rwhp but with that kinda hp you lose to much traction on a loose track like they where on so it really doesn't you much good unless you are on a tight track,now take all them trucks you seen the other night back to a track that is clay(or a hard track also known as a Tight track)and the stock PSD(or any other stock truck for that matter)will be left in the background b/c the tighter the track the better higher hp trucks preform to a certain point..that rule works with tugawar and dirt drag racing..
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Late Nights=04 Chevy LLY Reg Cab 2500HD,its lite and fast
Business Truck=06 GMC LBZ 2500 CC SB SRW,Custom Tuned
Weekend Warrior=1987 Chevy Silverado RC LB 2500,lifted with lots of extras
Economy Saver=02 VW Jetta TDI,Stock for now