I would call the VARDA office and see if they have any suggestions, or talk nice to someone like Summit River Lodge and see if they'll rent you a parking stall.
I've got the same trailer and 4 163's fit with lots of room to spare. Well at least enough room for 4 guys gear bags, a full size BBQ and enough gas and beer for 5 days
This sounds like a great opportunity for me. I'm looking at a 1acre property in vale so as a fellow sledder it's good to know that I may be able to do some cash storage deals. I'll post up when I get the property.