My crew has done the homework and we've been spawning dubstas for over a year and a half since they stopped spawning up the hill. This is my video, my method and use it at your leisure. I've helped a few people in this thread but hopefully this helps you out. I've made over 30 million selling this truck. I'm open for questions. We've perfected it and it is multiplayer sufficient. For single players it works also. Just gotta user the 'top of the hill' method we speak about drunkenly in the video.
Wow, what a great video and you've clearly figured it out. Question, when doing this solo you mention the "top of the hill" method. Is that the 1-2-3 method you used to spawn the first one in the video? If so, just use that method each time after the first instead moving to the other (east) side of the custom shop?