Why?? But i think the tire will be in the 80lb range for the rears and the fronts are 20lbs ish?? If you a a male in ok shape you can lift them if thats what your worried about. Bad back or really feable your not lifting the rears, as there awkward.
Now if the rear is filled with water, all bets are off, you can figure on antother 100lbs per tire!!