I've been on the Alaska HWY for the last week or so - During this time I've seem daily, multiple power errors. The errors range from high or low frequency and/or high or low voltage. The PI EMS RW50 has performed as advertised, shutting down the power until the error clears. Most of the campgrounds with power are off the grid and operate on generators. Really glad I have the system. I am also carrying a Hughes Autoformer, which I had to use numerous times in southern Canada campgrounds during an unusual 2 week heatwave. With everyone running AC (in an area where AC is rarely used) park power in most campgrounds, was stressed and very low voltage was the norm.