I can't help with the markings, but I can with the tyres. A parked aircraft must be earthed to stop the build up of static electricity.
normally this is done with an earth lead, sometimes called a bonding lead, usually to a specific point on the fuselage or wing, but it can be clipped to the undercarriage, the other end goes to a known earth point in the ground. To get around this problem
in field operations, the Luftwaffe used 'earthing tyres', the tyre was grounded (not sure how) to earth. These tyres were marked with a white band which looks like a whitewall. Sometimes a mainwheel was marked like this, you wouldn't need more than one such tyre per aircraft, so don't do them all!