I guess the pass just closed for the season...a day earlier than last year.
Time frame for next year will probably be a week or two later in May rather than earlier like Cinco de Mayo last year...though that was fun.
I'm sure they have a place to park the moterhome near...that town is made for things like that
Quick look shows about 5 places, including this one:
http://www.silverlineresort.com/