You guys pretending not to notice the difference with the 5th wheel are pretty funny. As some have mentioned, it's called a generator :)
Pretty big difference being able to run the coffee pot in the morning, maybe microwave up some dinner or breakfast.... watch a few minutes of TV before bed, run the furnace or A/C, blow-dry your hair in the morning, etc, etc. But other than those few things I suppose there is no difference :)
Of course you can do it with either (and I'm sure I'll be bombarded with stories of people doing it snow storms) but I have to agree with the OP that a class A is a bit better equipped.