Slate's upcoming modular pickup truck is among the more exciting recent vehicle announcements, as the low-priced electric machine is a bare-bones return to old-school mini trucking. The pickup's rear wall comes out, and you can install a set of rear seats where there used to just be open-air truck bed. Or you got divorced and no longer need room for the whole family. I, for one, love the idea of making our cars more modular to fit as many stages of life as possible. There are a few notable exceptions of production vehicles with modular bodywork, though, and a handful of unique proposals introduced as concept cars.