If you used the generator a lot for running the A/C, it might be the cause of the bad A/C, perhaps the Auto Transfer Switch too. The other things, besides the break in, are most likely just the fun of RVing.
One suggestion, you should install a
Progressive Ind. Electrical Management System (EMS) also available at Amazon.
Install it right before the breaker panel, so it monitors and protects against bad power from shore cord and the generator.
A bad campground pedestal can ruin a bunch of your electrical devices in a split second. An EMS shuts off the power if it's outside preset parameters. The great thing about the PI EMS is the lifetime replacement/repair warranty. The surge protection part of the EMS will sacrifice itself in a strong power surge. PI will repair or replace it. Other brands, after a year's warranty, you've got to buy a new one.