The K2s had 2 spare main wheels and two spare nose wheels in a forward bay that used to house some ECM gear in it's bomber days. They were on an axle which was winched up into the bay from a single hoist wire. The jack was kept in the compartment at the back of the fuselage usually known as Annie's hatch. Who Annie was I have no idea. Each main wheel drum had two tyres, so it may have looked like there were four main wheels.