Massey 444, I have it set up for 4500-6500 lb. classes. It does well in the 6-8 mph classes. I guess I will have to run in the 5 mph classes because the 7.5 mph classes are 4200 and 6200. I can't make 4200 and 6200 @ 7.5 mph may be a little too much to ask of the old 444. Can your M make 12 mph @ 6500 lb.? If it does that is one bad M!