In spite of more than adequate alternator power, the trailer batteries getting charged by the truck is severely hampered by the length and gauge of the truck charging system--most trucks barely are able to keep the trailer charged if starting out with a fully-charged system. I have dual alts and the truck still doesn't supply a lot of DC power to the batteries. If every thing in the system is in good shape, then you should be fine traveling with the fridge for 8-10 hours.
As to the generator, no problem starting it while still connected to the truck, have done that many times previously before getting the solar system installed. Still no problem kicking gen on when hitched/connected. Most, if not all, new trucks will not allow power to travel from the trailer to the truck.
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2016 Tiffin 40QBH
2015 38RSSA--traded
2005 36TK3--retired, but it was a good one
2017 F450 KR
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