I don't know about keeping a class-B on the driveway, but I do know the rules for my class-A say I can keep it in front of my house for 3 days to make packing and un-packing reasonable. I have a spot in one of the local storage facilities for longer-term storage ($54/mo which is pretty reasonable for a 35 foot MH). I'd suspect a class-B would cost less, but I am not sure.
Hope it works out for you.