Ok let me set the stage for you.
I'm pulling my 5th wheel home last week after a weeks worth of vacation. My combo going down the road had the following weight at an Oregon DOT scale: 4250 on the steers, 5800 on the drives, and 10,550 on the trailer axles total GCW 20,600. I had just driven through Spokane to get to the freeway. If you are familiar with Spokane then you are aware that Hamilton road has like 9.5' wide lanes with stoopid drivers. I finally made it to the freway which under construction with very narrow lanes and more stoopid drivers.
I finally make it out of Spokane and am pretty annoyed when I come up on this minivan towin a single axle U-haul trailer. On th flats he's doing ok at maintaining about 65 mph so I don't work on trying to pass him. We hit a slight hill which causes him to slow slightly and bang! I'm stuck as the freeway is only 2 lanes once you get past Spokane proper and there is a long line of traffic coming. Well I finally get a chance to pass him when the ground is level, and I know there are more hills so I go around him.
Well just after I get around him we hit a slight down hill run and he gains some speed and decides he is going to pass me. I see him bounce out in my mirror so I say no thank you and give it little more go pedal. Now get this, putz boy with his Yale sticker in the back window floors the van,I hear the down shift and a slight puff of "OMG this guy is killing me" smoke come out of his van. Now it's on like Donkey Kong.... I put my foot into it, boost gauge jumps to 30 PSI and I'm pulling away from him like he is running on 5 of his 6 cylinders. At 85mph I figure I had made my point of, "You are NOT
going to get in front so you can slow me down on the next hill". Needless to say after a few climbs I could no longer see him in my mirrors.
Did this with the truck dialed back to stock. It was pretty funny to think that a Minivan tugging a 2,000lbs that probably grossed 7,500lbs total could not hang with my truck pulling 13,400lbs of 5th wheel punching a 12'x8' hole in the air.