Just to confirm: the GenSet draws it starting juice from the house batts. The "battery boost" solenoid would not pick-up for you because its coil is also powered by the house battery bank. So some sort of manual jumpering can get your generator started.
And for what it's worth: driving for a long period of time so that the alternator can recharge the house batts is not recommended by most manufacturers (for those coaches that have the house-batts-charge-while-driving electronics).
Robi & Dale ---- Go Navy ----
2016 Winnie TOUR 42'
Tow: '08 Buick Lucerne