Update #2--Fixed! Well the fault went away, so not known, suspect water in outside receptacle.
The galley GFCI has only the one wire to it and I had it on load (my fault from when I had it out four years ago) Put that on line and now when popped it is dead.
Put the other GFCI in properly this time (I did have the wires from breaker on load) and now it too is dead when popped.
I never would have solved that without the help here--thanks again!
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Update. Tried plugging the trailer into the house bathroom GFCI today and now it doesn't pop. Out in the trailer that circuit (no GFCI now) has power.
But just for fun I tried the GFCI in the galley circuit (not popped) I pushed test and it popped, and pushed reset and it did. Then I tried the tester with it popped and it had power--two lights normal. Drat.
The GFCI in the house does not have power when it is popped for a test.(except for its little yellow light that comes on)
So maybe it was from the rain and now it is dry. Now I have to replace the GFCI and put it in right and also pull the galley one to see if I have it in backwards or something.