After watching Kermit Weeks get into his Douglas A-26 Invader, I wondered what other aircraft were difficult for the pilot to enter. At an airshow, I went into an Invader cockpit from the bomb bay. Kermit had to get a ladder, climb up onto the wing, open the canopy while kneeling on the plane's spine then slide in. I know the Douglas A-20 was another that looked tricky. Then I saw a video on the Handley-Page Hampton and that looked tricky too. The U.S. used rough black non-skid paint or something on the wing root of some planes to help pilot or crew chief from slipping. That appears to be an American thing.