The M39 series trucks seem fairly rare these days, or at least you don't see a lot of them coming up for sale. They can be found...but for obvious reasons, the M809 and M939 series are more prevalent. I like the M39 series (on which the M52 is based). I think it would be a great truck for a collector. While FASTTRUCK is partially right about the steering in that the M39 series generally has power steering that is not as good as on the M809, many of the M39 series trucks were upgraded to the "newer" Ross power steering found on the M809 series. I've had both and I agree with FASTTRUCK that the Ross is better, but the older power steering works fine. In fact, if you did not know any better, you would be happy with it. I like the sound of the multifuel engine with the 5 ton turbo...very throaty for a 478CI engine. Which transmission does it have? Does it have the overdrive transmission? The OD transmission will give you better highway speed, but the direct drive transmission provides more power throughout the gears. I once had an M543A2 with the latter transmission, and that truck would pull hard through all gears (once you got that mass of steel moving). But, top speed was 47 MPH, as opposed to probably 52-55 MPH with the OD transmission. In the end, I would make my decision on (in this order) condition, which truck I liked the best, and price. Good luck.