Red Mountain RV usually offers places to store trailers. Also try stopping by Alpine Motor Sports and asking Kim or Erik. They may still have their property and may rent spots for the winter.
Those are the only places that I know of off hand. I used to let Yammerhammer keep his stuff at my place but I won't be here to keep it plowed out.
You still have that mega-mileage Cat or did you spring for a new sled?