1) You're going to get answers all over the place here. Yes you can leave the propane on so you can keep the fridge cold (in reality you could turn off the fridge and, as long as you don't open it, your food will still be reasonably cold after a 3-5 hour drive). Many people will say leave the propane off while on the road period and others will say drive it without issue. Personally: We use the propane while on the road and turn off the fridge when at a gas pump--just remember to turn the fridge back on once you've left the pump.
2) Nope don't need the engine on at all to start the genny. Especially if you've been driving all day and your coach is wired correctly (typically the alternator will charge both the chassis and the house batteries).
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