hi everyone! my husband and I are about to purchase a truck camper with a dry weight of 4000#'s, that we're going to use for our dream trip exploring the western states(many high altitudes, steep climbs)!. We know we need a diesel, long bed, extended or crew, and a dually. We're just not sure what year, we dont want brand new--00-05. our friends swear by their 00 F-350 7.3L, that being the last year of the best ford diesel. we're just wondering if there is a certain year duramax to get-this probably dosent apply to chevys and gmc's-but just want to check. really respect you guys and your duramax luv!