While Howie is right that a surge protector doesn't address low voltage situations, there are combination units that do surge protection, low/high voltage shutoff, AC compressor slow start, polarity check, etc.
I use this one: http://www.progressiveindustries.net/ems_pt30c.htm
Last year, we were at a campground in a very hot/humid weekend and everyone was taxing the power grid. Several times this unit detected low voltage that would have harmed my AC and shut it down until the voltage rose back to a sufficient level.
Recently I had a problem with the shape of the campground pedestal bumping out such that the contact wasn't solid at the pigtail. That heated up one of the blades and oxidized it. I talked with Progressive Industries about it - it's not damaged. I've filed off the oxidation and will be sure to connect tightly even if that means Velcro straps around the pedestal.
Check the link and see what you think. Good luck!