I stayed a couple of times, usually, the first of June and went to this parking lot on a weekday. The lot was not being used and there were no trams running. I think this lot is used for very busy days as an overflow lot when the parking structure might get full.
I'm not sure how often the structure fills up.
It became a gamble to walk to that lot only to still find the trams not running, so you have to walk even further through the huge, empty parking lot.
I've learned not to count on using this, unless you are going during high attendance days.