If an electrician was involved with the wiring right before it was plugged in and smoked, you can be reasonably sure you were hooked to the wrong voltage. The electrician is, at a minimum, unprofessional and should be held responsible. He either can't read numbers, can't wire a circuit, or can't operate a voltage meter. Or all three.
The circuit breakers in almost all travel trailers blow on current not voltage, they should not have blown because of 220 or 240v alone.
There is no reasonable way to put the smoke back in electronic devices. The converter is bad and needs replacement. You don't just pop one of these in in 5 minutes like a new toaster, there are bundles of wires that need to be unhooked and reattached. A professional with experience might do it in an hour. Do not have the guy that hooked up the wrong voltage to the plug do this for you. He doesn't know what he is doing.
As noted in other posts, the bad converter is likely only the beginning of your troubles. This happened to my father, and it cost him every single appliance in his TT. He tried each appliance "to see which ones had been hit by lightening".
Make really sure you are unplugged from the offending plug, and make sure there is no possibility it can get plugged in again. Smoke and sparks from many thousands of dollars of hardware is bad enough. Down the street from my home a TT burned to the ground from this.
