It is necessary to have a generator in a 5th wheel, I know some have them some don't. We are looking to go to a 5th from our class a and we really don't use ours a lot now.
I am looking for one. I have a 40' 5th wheel. But I need it to run my woodworking tools and stull. Or if there is an emergency where we lose power for more than a couple hours.