Larry:
Over the years, I worked (as EC) for a company that did 'first responder' type vehicles. A few of the larger rescue rigs had gensets & 'shore power' with 120/208 or 120/240, 3 phase QOB panels.
Doing the installs, repairs, retrofits, etc. we followed the 'plans' from an engineer. That was based on NEC, and trade practices. A manual, 4 pole transfer sw did the gen/shore power choice. Gen and shore were bonded to the truck frame. All the 120 was GFI.
Shore power was via a 100 amp (overkill) RS pin & sleeve.
