Yes the new circuit shouldn't be a problem. I know a lot about wiring and electricity. Wow that is a lot of snow! It's good to know that nothing froze. Our first trip is Easter weekend and it is always a crap shoot if it will be in the 70s or a foot of snow!
I have a 2007 3000RK and we HAVE a 120V outlet in the basement already. It is mounted in the Ceiling of the compartment next to a DC outlet (and cable connection).
It is hard to see. If you are at the curbside access door, look towards your laundry basket/trap door. The drain lines from the shower and bathroom sink will make it hard to see but it should be up there between the pipes and the trap door.