50 Amp wiring

I am amazed at how many people who apparently know nothing about how to wire or even test the wiring of a 50 amp receptacle are willing to post their opinion on how it should be done. Surprising someone hasn't been killed with all the incorrect information posted on this thread alone. Any properly wired 50 amp receptacle will read 240 volts +/_ across the two parallel flat blades. It will read zero volts from the top blade to the bottom pin and will read 120 volts from either side blade to either the top or bottom slot. There will only be one physical breaker but it will be a double pole breaker meaning it takes two adjacent slots in the breaker box and is connected with a bar that causes the entire breaker to trip if either pole detects a load greater than 50 amps. Wiring such a receptacle will be a piece of cake for an electrician, like someone else pointed out it is no different than wiring an electric range, the only difference is the blades on an RV plug are slightly different than the blades on a range plug, hence different receptacles, but all the wiring is physically the same. If the receptacle matches the plug on the RV exactly, it will be wired correctly by any licensed electrician. The problems that occur are when 30 amp RV receptacles are improperly wired due to their physical similarity to the old 3 wire 30 amp 240 volt plugs there were used for dryers, welders and the like. Dryers and the like are now 4 wire, leaving welders as the last holdout for three wire 240 volt connections. Any 4 wire plug should be wired correctly.