50 Amp Shore Power Tester
With the coach still in storage due to the late spring here in Minnesota, I am keeping myself busy. 
My son and I decided to put together a 50 Amp shore power tester. This design has been posted before, I made an improvement to use a 3 gang outlet box which allows 2 line voltage meters to be plugged in side by side.
Here are links for the various parts, pictures and a schematic. I estimate I have about $50 invested, but now I can be sure the 50 amp shore power is wired correctly before I plug in my coach.
Note the 2 red neon indicators wired across the 240 volt hot leads will detect a "fake" 50 amp power pedestal. If the red lights don't light up, someone cut corners and only wired the pedestal with 120 volts. In this situation, your coach is only getting 1/2 the power it was designed for, and you run the risk of overloading the white neutral wire in your power cord and coach.
Prime Products 12-4055 A/C Line Voltage Meter : Amazon.com : Automotive
GE 50542 Receptacle Tester, 3-Wire Light Improper Wiring Indicator - Amazon.com
Amazon.com: Camco® Power Cord Plugs with PowerGrip™: Automotive
Radioshack.com: 120-Volt Neon Red Square Lamp (2-Pack)
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Topic: 50 Amp Shore Power Tester