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If you remove the DC mini-breaker from the trailer mount (2 screws in the base mount) you might find the amp rating on the bottom. If there's no label on the breaker, possibly there are others mounted nearby. If so, look at the gauge wiring on them and their amp rating. Usually "similar wire sizes are connected to similar amp rated breakers" but that is not always true, just a "generality"...
If there is nothing else to go by, here is a 12 VDC amp/wire size chart. While it is not "RVIA certified and not Keystone approved" it is a "generalized chart that depicts wire size with amp rating for the "average length wiring run" (whatever that might be).
Generally speaking, 12 ga multistrand wire uses a 10 amp breaker, 10 ga uses a 20 amp breaker, 8 ga uses a 30 amp breaker and 6 ga uses a 40 amp breaker. That said, longer runs use larger gauge wire or smaller amp breakers. A "long run" would have a larger voltage drop which increases amperage and means larger wire to meet the watt demand for the circuit....
Hopefully, you'll find that label on the bottom of the breaker can or a similar size wire on a breaker nearby that you can use as a "probably the same rating"....
Keep in mind that Keystone does not provide any "proprietary information" on their products and they consider wiring diagrams, plumbing runs and structural blueprints to be "proprietary information" so Keystone probably will not even tell you where to start, other than to say, "Please contact your dealer for that information".
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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