The driveway is very level. The furnace won't be running much as the weather will be cool but mild. I think we'll have enough clearance from the house for the furnace, but we'll be mindful of it. The door will be over the yard of our family's house. We've discussed that they'll need to chat with the neighbors about it. From looking at the laws there, the only restriction is that you can't park in the same place on the street for >72 hours. Thanks for all of the thoughts and recommendations.
Thanks everyone.
