I have a covered carport I bought at Costco so I load my sleds on my open bed trailer lift the tracks off the ground put some fuel stabilizer in the fuel and fog the motors and back the entire rig into the carport for the summer. I've done it this way for a couple of years now.
Oh one small hint, I tie the carport to the trailer just incase of any windstorms that try's and takes my carport away.