We had 110VAC & 12V DC wall plugs on our boat. It wasn't exactly fool proof (there was just a label above each that said AC or DC), but it totally worked if you knew what you were doing. We had a bunch of devices that could plug into 12V DC directly and avoid the inverter penalty. Phone chargers, lamps, laptop chargers, etc.
my Chrysler Town & Country van has 110v outlets in the rear of the van. Occasionally, we trip the breaker but for the most part it works rather well too.
