</font><font color="blue" class="small">( Mosey, I know it is a stupid question but did you have the same amount of fuel, people, etc. both times you weighed?)</font>
Spencer - I'm an engineer, so I made sure to account for everything! I didn't drive the truck much, since it had the rock in it, so I only used 2.5 gal of gas and assumed about 9 lbs per gallon (I weighed a gallon of apple juice in a plastic container and guessed that gasoline would be close to the same weight), so I added 22 lbs to the empty weight. I was in the truck both times when they weighed it. I know 870 lbs seems like a lot for that size rock, but it's true! When I get a chance, I'm going to get a full bucket of wet dirt without any ballast and see if it also brings the rear wheels up when I try to lift it. I will be careful!