One item that I have found in Mexico and further South is that in the same campground one outlet 2 prong it will be correctlly wired and the one next to it will be backwards, I have 2 very simple testers they have 3 neon little lights and you inset in the socket being tested,and depending on how they light up I can see how the wall socket is wired, why two because on one I cut the ground prong, I used to have an addapter but that turned out not to work too good, I also made adapters to correct the fault, in other words to reverse the way the outlets are wired, it is easier than opening the campgrounds property.
I actually carry 150 feet of electrical extention cords, one 100 foot and one 50 foot on top of the 25 foot 30 amp from the RV and the 50 foot 30 amp extention plus the various adapters for 50 to 30 amp to regular household plugs, I also have a 100 foot hose that is made with the same material as fire hoses only smaller and it colapses onto an orange ladder that is made for electrical extentions (home despot has them) those have proven invaluable when needed, the other item that is useful is a colapsing bucket (for feeding horses) for water or washing muddy kids and the RV of course.
If I remember more good tips I will post them
navegator