Doesn't sound like a good idea. Your proposed new fuses have the potential to interrupt the electric brake circuits, as well as the running lights, brake lights, and so forth - without providing any indication to the driver that these circuits are no longer functioning.
From a safety point of view - which is what fuses are for - each of these circuits is already fused at the proper level within the tow vehicle.
You can interrupt the line to the backup lights, and the battery charge line with no safety issues. The others, not so much.
Bill
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