I had installed the 1.3 gallon tank in our Santara C. It was the best thing I did. Showers using the pump were comfortable steady flow. We also get about 3 toilet flushes without the pump running. I also isolated the pump with rubber mounts and put the foam pipe insulation on all of the hoses. Made a huge difference. Our water tank and pump were under the bed in that rig.
Here is a photo:
The insurance adjuster needs to be involved and I would ask for a written signed statement that everything was found OK.
By the way, the wiring most likely is OK. All AC 120/240 wire is rated for 600 volts. It is the items plugged in that take the shot when the wrong power is applied.