Did you read the review for this item?
"WARNING! DO NOT BUY THIS IF YOU HAVE A STANDARD 50AMP RV PANEL IN YOUR RV!!! The two hots being bridged brings a full 240v into your RV and will damage beyhond repair any and all electronics including your microwave, stereo system(s), Converter/Charger and anything else that is expecting 110v.
The proper way to connect a 50Amp RV supply to a 50Amp Welder outlet is to have a dog-bone that bridges the GROUND and the NEUTRAL wires, NOT THE TWO HOT LEADS.
I speak from very expensive experience. Turning on the breaker immediately destroyed my Charger/Converter, killed my microwave/convection oven, burned out the 110v heater element in my hot water system and blew every 110v lamp that was turned on.
The total amount of damage is well beyond $1500."
Pretty much explains what happened in your case.
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