Listen people. DO NOT WORRY THAT MUCH ABOUT YOUR CAR BALANCE.
I never once put my car on a scale during my 2.5 years with a losi car. I put the speedo on the left front up by the standoff, the reciever on the right with about 5 pieces of weight and the weighted tray and the rest of the weight wherever you can fit it and drive the car. I'm pretty sure I couldnt tell if the car was out of balance so I doubt it makes that much of a difference.