Advice needed on upcoming trip

I like your plan! Sounds like an awesome adventure. I agree with finding secure, indoor storage for the whole rig. Put a large supply of rodent poison in the storage unit, put stabil in your fuel, make sure the holding tanks are empty and clean, make sure the batteries are all fully charged and disconnected. Turn the key and catch a cab to the airport.
Every city with a big airport has a storage facility that your camper and bike will fit into. The peace of mind alone is worth it, but keeping your stuff out of the weather will be of huge value in keeping your stuff clean, in good shape, and not stolen.