All 50 amp plugs have 4 prongs - 1 for ground, 1 for neutral, and 2 for the two 110V circuits. All 30 amp plugs have 3 prongs in a triangular arrangement - 1 ground, 1 neutral, and 1 110V circuit. Voltage is the same, but with 50 amps, you can run more things at the same time. For example, my trailer is wired for 50 amps, but only one A/C. But I can run the microwave and a small space heater and the A/C - all at the same time. Hope this helps.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.