W&R With No* Road Vehicles?

So we have helicopters, trains, ships, planes, cable cars, trams**, metros, conveyors, pipes, and probably a few things I've forgotten. Why even bother with trucks? Just because they're cheap, accessible, fuel efficient, flexible, balanced, and easy to set up, and the game is clearly built around the assumption you will use them as your default transport option? Pfft, your sensible reasons mean nothing to me.
*unfortunately there are some road vehicles we can't avoid, but
**do trams count as road vehicles?
Not too sure about my approach to this series, but I got a few episodes in before I started having doubts so might as well upload and see how you all like it. The challenge itself is definitely good fun though.