She's the last of the Cat powered pre-emission trucks. It's lack of DEF/DPF and other emission BS makes it quite desirable. It's running about 1850 ft lbs of torque, newer rigs can go as high as 2050tq/600hp but they don't feel near as powerful as these old Cats, they were underrated quite a bit.
I sold these guys for a living for 10+ years, still connect with many other dealers and companies in the business and broker/sell them still quite often. None are usually as pretty as this guy, i stick to the vocational/oilfield type trucks. This would make for a great Farm truck around here pulling super B grain trailers.