Just hauled the first load, 10 tons of rock for a small project here at the farm. Wanted to haul a few light loads to get a feel for the truck before loading it up. 10 tons was completely a non-issue, slowed down a little on the hills but otherwise you couldn't even tell it was back there. Will load it to 12-14 next trip.
Empty weight was less than I expected, 21,700 with half tank of fuel. I think my limiting factor is going to be the 16K front axle. I was at 14K on the front with only 10 tons, might have to get him to load it more towards the back. Overall, so far so good.
As long as I clutch going into 3rd/7th it doesn't pop out, just a little annoying but I can work with it for now. Still trying to get used to the gearing in this truck, with 4.88 rears you go through the lower 4 gears really fast, then 5-8 are bigger jumps. I think it will be fine once I figure it out. If I were driving it all day, every day, the 13spd may be benefical, but I'm not. It's just to support the construction business, not make a living hauling for others, truck will probably only see 5-10K miles a year.