My take: Just like sitting, standing, slouching, and crouching are all examples of human stances....rake is a particular kind of vehicular stance. Forward rake, rearward rake, level, slammed....all are stances. Lowriders and cars with 'bags have adjustable stances. The tuner crowd has borrowed the word and "verbed it" to describe a very particular variation in which the tires are canted; hence, "stanced". It's not really a stance at all, but it is unique, and needed a descriptor. So IMHO the verbed version ("stanced") belongs to the tuner world now...but "stance" is still a broad term that covers any possible way a car can sit.