I have a 2016 Sprinter based class C and added a Thornwave PowerMon and shunt. The shunt is mounted in the battery area under the step. The PowerMon is in the cabinet closest to the door. I hooked up the chassis battery sense wire, so I have chassis and house voltage. The shunt is on the ground wire (easier connection).
It has great BlueTooth range (I can check it from the house ~40 feet)
The PowerMon shows chassis and house voltage, house current, power, charge, battery capacity, peak current, temperature (remote or ambient), also logs data and can control a relay.