If I actually had 18,000lbs behind a 2005 dodge ram 3500 SRW with a cummins. (sorry about the misquoted weight, I had to add up all my weights again) 12,800 for the tractor and 5400 for the trailer. I see you live in Texas, that's nice, guess you guys don't have any mountains to try and climb or make it down safely. I had hills that I was climbing at 35mph because the motor ran out of snot 325hp, 600+ftlbs. I had to be pretty careful where I put the machine on the trailer because the tongue weight was so much. There are a ton of stories about guys pushing 40k with a 1 ton dually going across the scales out west. It is a whole different ball game when you start talking some decent grades and stopping rather than driving across the plains. I never had an accident with my truck, but I was white knuckle driving and that was no fun. I pull the same trailer and same tractor setup behind my international, and its like going for a stroll. I actually shift the tractor forward to get some more pin weight because the truck just eats it up having a 17k rear axle.