Just a note that may or may not be of interest and I do realize this is old, we have Longacre Kart scales and while only 3 scales are used for a sled, the 4th must be plugged in or the reading is off. Again, at least on ours. I weighted our 94 VM4, all fluids, 1/4 tank of fuel and it was 612. Just for the record we use our scales just about every week in summer and are always with in 1/2 lb of track scales where ever we go