I will admit I was bad and was using the 30A to 15A adapter to run my A/C while on a generator. The plug got hot a couple times but the rest of the cord never got warm so I didn't worry about it too much. And it never tripped the breaker inside the motor home.
Then Monday I had it plugged in to keep the fridge cold since we got home from our July 4th trip so late we didn't unload, I got home Monday evening and found the fridge was on propane because the breaker labelled "Main" had tripped. The bathroom fan was running, and the fridge were the only items on. Again I didn't think much of it so I flipped the breaker and didn't worry about it.
Then last night is when it tripped the GFCI. So I started digging. Found the over heated wires. Thats where I've left it for now.