Carving,
Thank you for being honest up front, but now.....
I have some things that you should check out carefully before you spend money.
- The converter may have survived. The newer are switcher types and don't really care a lot about input voltage. Check it carefully.
- The water heater probably popped a breaker before the element fried, but even if it tests sort of good, check the heater to ground resistance. (This will required that you disconnect it.)
- The A/C will be OK if it was off.
- The Microwave, the TV and anything else that is always powered on AC could be toast.
- If you have an RV reefer, you may have taken out the control board and the AC heater.
I did a lot of boat work before the depression. I saw this more than one might think. In one case, the marina screwed up and spiked the dock AC with 168V. Another time, lightning struck a service pole and did just an amazing amount of damage.