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"Modern" mechanical fans can have electromagnetic clutches (if we misunderstnad each other here). The "free wheel" is different.
The amperage draw for an electrically-driven pair of fans to cool a hard-working 1T truck radiator is huge. A bigger alternator is called for (and the re-size has to have a load reserve margin increse as well). 140A to 220A would be about right, assuming one can find an ambulance-package factory alternator.
Even with an older style mechanical clutch the trade-off may not be worthwhile. The HP draw may be similar, and one is hard-loadng the electrical to do it.
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