I had an occasional fuse "pop" when I had the camper plugged in, seems that at times 10 amp was exceeded (flashers turned on?), auto elec said it was fine to put a 15 amp fuse in (having checked there were no other issues), never had a problem with the trailer attached since.
Note: I would only up the fuse if confident that the load on the circuit was a "legitimate" load and not another "issue". and that he wiring could take it (as advised by a qualified auto elec).
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