soft serve ice cream truck ala Mr. Softee?
Unfortunately not a truck and not quite Westside, but Gill's Ice Cream in the Farmer's Market at 3rd and Fairfax has decent soft serve. They even do a chocolate/vanilla swirl.
I keep meaning to try the Carvel at 11037 Santa Monica Blvd but haven't made it yet, so I can't compare.
I've seen ice cream trunks in some neighborhoods, but I don't see soft serve, just the prepackaged bars/cones.
Carvel's one option, there's one on Santa Monica Blvd near Century City, I think.
As I am guessing you like cupcakes from your moniker, Costco as a soft serve ice cream on top of a half cupcake contraption from phillyswirl (http://www.phillyswirl.com/products/c...) that they sell in the freezer section. Surprisingly the ice cream is really soft and they are pretty good.
There was one that would come by Apt. in North Hollywood (Magnolia & Vineland). It was really good and came around twice a week. They sold Soft Serve, Real Ice Cream by the Scoop, and Nachos. It would always be on my street around 7-8pm. It would stop a three places on the block and every stop people would line-up. I must the street was ALL Apartment Complexs, and boy was it ghetto.
I know live near Victory and Coldwater and have yet to see anything like it. Oh do I wish that would roll down my street now.