RE: Toe-in or toe-out on a warbird?
A Sopwith Camel at rest has negative 'camber' for the top of wheels lean toward the fuse. That was a fine explanation of 'wheel engineering' but still doesn't address caster changes with stab angle of attack changes (stab going up or going down). For fun make up a dummy set of wheels on an axle and play with it for anecdotal evidence.
Some of my landings have had the end result of negative camber and toe out!