In our gasser, I made it a point to test the voltage right after plugging in. We stay mostly at KOAs and I wasn't expecting a problem. The voltage did vary, but never more than 125 or less that 109.
One of the projects on the new rig is to install an AC volt meter right above the door near the genny controls. The autoformer is on the list, especially since I'll be installing LED flat screens this spring.
As I said, people who go out and spend $200-$600 for a power conditioner or surge protector have probably have to spend a lot more fixing things that got fried. I yield to their experience. Heck, frying one converter would pay for the autoformer.