Important - check this every time you set up

Yikes I never knew this. I will investigate and buy the right item

I have just installed a Progressive Industries EMS-HW30C electrical management system, hardwired into the shore power lead-in. Do you see any potential electrical faults that would get past this device? It is advertised to protect against:

Yes, we often use extension wires to extend meter leads.

While a NCVT will alarm reliably down to 40 volts or so AC, the Gold Standard test is to actually meter between the chassis and a known-good service panel connection. That usually entails a run of 100 feet or more. As you can see, that's only done in extreme circumstances, so the NCVT check is a great Triage method for finding bigger electrical grounding problems.  

Thank you JMSOKOL for the clearest concise explanation yet of the grounding issue.
Impedance is the key to understanding this!
Thanks
 

Here's the deal with "ground rods". They don't actually "ground" your RV the same way that the "ground wire" does. Why the confusion? Well, the "ground wire" is actually a bond to the neutral conductor in the main service panel, in addition to an "earth ground" connection via the ground rod. The "ground wire" is more properly called the EGC (Equipment Grounding Conductor) and will have an impedance of under 1 ohm. This allows it to trip a circuit breaker quickly in the event of a line-to-chassis short. On the other hand, a ground rod by itself can have up to 100 ohms impedance to earth and still be code compliant. So a chassis connection to a ground rod by itself won't draw enough current from the circuit breaker to trip it in the event of a hard short to chassis.

Hot-skin conditions come in at least three flavors. Low-Current, Mid-Current, and High-Current. While a ground rod by itself might be able to shunt the Low-Current variety of a few mA (milli-amps) to earth. It won't be able to reduce the voltage of a mid or high current fault. And any Low-Current fault can easily escalate itself to a very dangerous Mid-Current (10 mA to 1,000 mA) or High-Current (1 to 20 amperes) fault at any time. So while a ground rod by itself can drain away what would normally be non-dangerous tingles, it can't do anything to clear dangerous shocks.

Plus the NEC doesn't allow for a remote ground rod that's not bonded (attached) to the primary service panel's ground-neutral connection. The reason for that is all the points I made above.