There was only one prototype PW with a diesel that I am aware of. Built for Chrysler by Kore and shown at Moab around 2006. The word I heard is that Chrysler decided not to market diesel PWs because of weight and overall length. Diesels are heavy and make the truck less suitable for their target market, which includes offroaders and professionals who operate a lot in mud, sand, and snow. Having the truck nose down in mud is not a pretty thing. Length is an issue because the diesel intercooler prevents using the hidden winch mount that the PW comes with, and thus requires a winch bumper hanging out the front. Add the weight of the winch bumper plus that bigass winch leveraged out over the front, and that aggravates the weight issue on the front end. Plus, the PW is fairly long in conventional form, and the length of the bumper and winch would make it that much tighter on some trails. As with any vehicle purchase, you need to decide which aspects are most important to you, and how much you are willing to pay to get close to your ideal vehicle.