Boondocking Whistler

Many of the ski resorts in the Pacific NW allow parking lot stays of anywhere from 1-7 nights for RVs. I have a small 21 foot Toyota Dolphin and was hoping to use it in Whistler this winter. A few years ago it looked like overnight parking was 'ignored' in Lot 4. Has that changed?

I know there are a few RV parks in Whistler, but the winter rates are pretty high. Any suggestions would be appreciated!