Depends what you mean by "long drive". I regularly drive a 400 mile trip in my D2 V8, and I'm going to be covering 1600 miles next week. Aside from checking fluids before each leg, I don't prep it any more than any other vehicle, and I don't carry a whole list of spares "just in case". Even when I had Series 109"s and Defenders, I didn't worry about break-downs, because I knew I maintained the cars properly.