I have had 100lbs (50 lbs each) of wheel weights on my garden tractor from day one (1992) using it year round, mowing in summer, snow removal winter and never had any drive train problems yet. So just what damage is 70lbs of water in the tires going to do? Break the houseing, bearings, gears, over heat the oil??? I just can't see any harm in it. The weight isn't on the axle. Sorry I just don't agree on this one. Another thing I can't understand is how a home owner will fill his tires with washer fluid without a specal pump. So as the tire fills with fluid where does the air go?