This thread pushed me over the top to order with the LP Onan from the factory, lot's of great useful ideas,
1) run while on the last leg of the haul to pre-cool the RW,
2) place to park the dogs with A/C while roadside dining,
3) power during an ice storm at the house ( was out of power 10 days a few years back)
4) Emergency power in the case of dead batteries
Thanks for some great feedback, I espiceally related to the 4wd comment, nice to have when you need it.