Jerry's home-built press should work. Once you apply pressure with the press, take a BFH and hold it against one side of the axle where the kingpin goes thru, and smack the opposite side with another BFH. That makes the rust molecules quit holding hands to cover their ears.
The shock and momentary deflection of the axle helps loosen things up. A little heat will also make the parts loosen up as has been said.
