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48V danger is debatable, but it might be a good idea to start adding RCD protection to the power sources (yes, this will bring your rack down (or just one output), but better than having people getting stuck to wires or tools causing short circuits)

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Is this possible? Fault currents are much more obvious at a higher voltage than lower, and I thought most RCDs would not be made to be sensitive enough to catch what might be a dangerous DC leakage.

Yes (not sure if there are existing products), because they work based on the difference of currents leaving and returning. (between 48V and 110V there isn't an insurmountable difference in detection capability needed)

Theoretically you should have zero leakage, and you should also trip on bigger currents (but a rack wouldn't use more than 10A maybe?)

RCD? Yeah, its usually the AMPs that kills you not the voltage.

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