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Did you actually check the fuses? Many times they look good and aren't. This may be in the headlight switch. Having a 12 VDC test light would be a big help here. About $5 or so at most hardware stores. Or a small digital multimeter would be good too. Check the bulbs and sockets as they may be dirty from condensation. Those are all things to check first. Then get back to me if we need to dig deeper on this. All follow ups are included in our fee.
IF you have no way of testing the light switch, then that may be the case. It might be a bad ground, but you might not have a good way of putting in a test ground. Perhaps check with the campground and see which mobile tech works in that area.
You are welcome.