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It’s easy enough to calculate the “total” amperage draw on the brake circuit or simply use add Dexter service manual and they have a nice chart showing total current draw of 4 electric brakes... 10 amps with all 4 brakes applied at full power.
Pic is a typical wire diagram of trailer with emergency brake circuit fused..
Second pic from Dexters service manual
A 15 amp standard ATC fuse or resettable breaker would assure enough headroom for voltage drop along the length of the wires and the fact all four brakes are wired in parallel.
And part of my hook up routine is for wife to pull emergency brake key while I listen back at the axles for the “tell tale” clunk indicating my emergency brakes do in fact work.
They are fused and I don’t have to worry about burning up the RV with a pulled emergency brake key drawing full DC current until it melts the wire harness and arcs to something else
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