I had an NPR in my business and although it topped out at 71 mph and took a while to get there, in 180k miles it needed a set of brakes and an alternator and that was it. It also seemed to carry anything put on it's back. For one trade show 60 miles away, it carried a John Deere 4310 tractor with loader on it's back and a Mahindra 2810 with loader on the trailer and a big commercial mower. I don't know how heavy it was but I know it was well over.
