The electrician I'm talking about also has a work area in the front (side closest to the vehicle) which has a workbench and a charging port for a laptop. Actually works very well for him because he can unbox panel and meter boxes and prep them right there without having to make a mess in a client's house. Probably better than an oversized truck.
I also like the idea of trailers because if you haul something which breaks or damages the trailer, it's probably cheaper to fix/replace the trailer than a truck. Maybe just me though.