Generator start from deepcycle batts OR dualpurpose batts?

Short answer yes.. The generator starts off the house batteries, the starting draw of the genny is fairly low.. in fact once when I accidently killed both house and chassis batteries and thus had nothing left to crank her up with I dug out one of the garden tractor batteries I used on my wife's scooter. these very small batteries are like less than 10% of the house batteries. And it fired right up and held till the transfer switch kicked in and the PD9180 began providing power..

So it really does not matter. to a pair of GC2's (230 amp hours) the starting demand of the generator.. Is less than what a golf car would need to move you to the next T.