Thanks all for feeding me thoughts, facts and opinion on this - it is helping me get my mind around this a bit. I will need to work to get comfy with the idea of a Ford V10... Having had a couple diesel motors I loved that could take me some time.
For the specs... I was assuming smaller tanks and I am confident we can live with that. The huge capacity of the hauler was always way more than we ever needed. One thing that does seem low is the amount of propane spec'd for a lot of rigs, and it seems especially odd for those with propane gensets. I'll need to dig into that more.