The major undates that I can remember is. The drop frame, 2-4-6 point landing gears, Disc brakes, heated tanks and slide floors, GY tires, slam baggage doors, roof and insulation R values....the list goes on every year. Some things are an option...some are standard. Depends on the what you want to spend. A BH is not far from a LM. Kinda like a Buick to a Cadillac.