Posted 6/12/2009 00:36 (#742141 - in reply to #742121) Subject: RE: A little more information required..
Blvd d'Espair Bowhill, Sth Aust
Still missing some infomation, but my best guess from a long way away, and a totally different set of life experiences, is that you have a total weight of somewhere around 12,000 pounds.
12000 x 65 % / 2 says that each tyre needs to support 3,900 pounds.
Hawken Cougar's suggestion to go read the sidewall is likely the best advice you'll get here.