urm yeah
Is this / has this , been thought about? I know that the mechanics of the game would do it and the principles are the same, so surly it wouldnt be too hard to add and will you be doing so?
Would makefor soem great economical engines. Possibly a “Work horse” Expansion where you need to make vans/trucks ?
Just putting it out there 
Its quite hard to do though actually, a lot of stuff is quite different in terms of design perameters.