are you talking about your posts? They usually arn't that tight, just sit/straddle the keg on the floor and use a closed wrench 7/8" I believe. Or if they are not leaking, just clean the kegs and use them withouth replacing the orings.
For the price you payed if you are still having trouble after a good soak you might want to run down to your local automotive maintenance center and have them take a wack at it with the impact wrench. I cant imagine that they would say no if you offered some home brew in trade.