with our Roo, we run ours on electric 24 hours before we leave. if it's a short trip, like your 2 hours, we leave it until we arrive at the campsite.
most of the time we dry camp so we switch on the propane side.
but it stays plenty cool on short trips like that.
but for longer trips, we have no problem running it on propane while traveling.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC