I googled a basic camper wiring diagram utilizing a converter and it appears to be consistent with your situation. It looks like the A/C coming into the trailer is a pass through into your outlets via the breaker panel. I think most wiring would have easily handled the voltage difference between 110V and 220v... so my guess is that the core of your AC system (wiring, breakers, distribution panel, etc.) is ok.
Unfortunately, it also means that the 220v got passed through directly through to all your AC operated appliances and anything that was plugged into a 110V outlet. You may have popped the fuse on the control boards for each of these but probably not since the fuses act on current..... I am guessing that it was a pass through and you have done significant damage to each's appliance's control boards...... This could be anything such as electronic components, relay armatures, etc. I am guessing you will have to go through each of these and replace the control boards as a minimum until you get it to work..... unless you know an electronics whiz willing to spend a lot of time to troubleshoot. Even if you do get it fixed on the component level it is likely that you have stressed the remaining components making them susceptible to early failure. You see this a lot of time in Ham Radio gear that is struck by lightening. You might be able to fix it by replacing individual components but you can count on further failures as "overstressed" components have shortened lives.
Depending on the sophistication of the converter circuit (and the self protective circuits built in)..... I am guessing that you have converter damage as well (letting out the "magic smoke" will usually do this). This will result in an inability to charge your batteries.
Good luck. This is recoverable but I would go ahead and budget about $100 for each appliance for repair PARTS and then be pleasantly surprised if it doesn't require it. There are lots of videos on line for you to perform your own repairs..... this will save you a lot of money and labor charges for repair. Once you get past the control circuits the actual components in the appliance (compressors, microwave power circuits, heating elements, etc are mostly basic) and since the power was just being hooked up... none of your appliances were running and so none of these basic components were probably exposed to the 220v.
I am still a "newby" on camper electricity; but I do have a lot of experience with electricity and worked in the power industry for many years...... So others can correct me if I am wrong.
