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I remember ordering a couple of fire trucks (F-550s) back in the 7.3 PSD days with the factory dual alternators but I don't remember if they offered that same prep package for the V-10 trucks........
I saw Lincoln Town Car stretch Limos and SuperDuty Limo Buses with dual alternators back in the day.
check these guys out if you cant figure out a factory solution. I recall them doing stuff for High Top Limo Vans/ stretch limos years ago. At the very least they could probably put you on the right track.