Here’s my current one.
The utilities are all from the Aftershock mod (fridge, freezer, MetalMaster, cooking rig) and the trunks are all cargo troughs from the same mod, but you could easily replace those with a welding rig, chem lab, fridge, and foodco, and the troughs with cargo spaces. After a lot of experimentation, I’ve decided that smaller cars tend to be better.
Of course, there’s nothing wrong with a big ol’ steel-plated battle bus every now and then~