I have located a 5 ton cargo and a 5 ton dump.they both have turbo mack engines (6 cyl).are these an original military setup,or are they something some one stuffed in there?I have not talked to the owner yet ,as they are closed on the weekend.just wanted info before I call.if they are original are they any good ?I have not seen any other MV with this engine.can it be replaced with a multifuel if it failed.