Lots of these are set up for 120v only. Even larger campers that have 120/240v cords have all 120v equipment just split between poles. If you just need 30 amps, and everything will run with 30 amps, just bridge both poles together and run your 30a cord to the box thru your 30a inlet. As long as the cord is connected to a 30A or less ckt, ether at the shore power or a 30 a 120v plug on the generator, your covered. If you wish to retain the 120/240 system, you will need a 4 pole inlet and a 4wire cord. You can ether buy (at a camper supply store) a 4wire to 3 wire adapter, or make one. to allow you to connect the 120/240 cord to a 120v supply. As long as the cable and connectors are sized for the largest amps the supply (generator or shore ckt)you will have no problems. The size of the main breaker in the unit is not a big factor (but must be at least as large as the supply.)as the building breaker (shore power) or breaker on the generator will protect the supply cord. I assume the vehicle has a breaker panel that brakes the 30a power cord down to 15 or 20 amp ckts. Robert
