NoVa RT wrote:
Good news! When I got to the campground, I plugged in, and everything works. I'm thinking the problem must have been the 30-amp-to-20-amp adaptor I had used to plug in to the house. That's an inexpensive item, so I consider myself pretty lucky. Thanks to all for their suggestions.
That is very good news! As I mentioned earlier, the Tripplite inverter/chargers are known for tripping GFCI outlets, so that is by far the first place to look. There doesn't appear to be any solution to the problem other than wiring up a non GFCI outlet to plug into at home.