RV's can be wired either way
many have the genset wired to chassis battery
it takes less power to start the genny than the drive engine
the problem with the 'emg jump start'
is many mfg wire the switch to the chassis side
a totally dead chassis battery will not power the relay
the switch is on the dash, and the mfg takes the easy way out
but IMO the emg jump should be wired to the house batteries to power the relay providing the jump
i have had almost dead chassis and very low house batteris
but was able to emg jump start the genset to power the converter to boost the batteries so i could then jump start the drive engine
