I am just shy of 16,000 miles on the 04, and since I don't have a trailer heavy enough to tow, I do have access to road millings. Would hauling around a hefty (maybe 2,000+ lbs. ) load of these millings for a few weeks help to loosen this motor up? I know 15,500 miles is a bit much to start thinking about break in, but when I bought it last Nov. , it only had 6,000 miles, and about 28 ave. MPH. Demo model=idle time.