I'm pulling around 14,000. Boost is only putting out 20-25 lbs when it is going slow.
I'll take it in to Earnhardt soon. If they can't diagnose it they will put a flight recorder on it to see what is going on. It used to pull that load at 55+MPH on the same grades.
My buddy in a 24' motorhome with a V10 towing 1500 lbs can pass me.....
