From the FG it is possible once you have broken your opponents legs open to go straight to the Truck position. From there you can attack with a Calf Crank or threaten to go for the Twister.
The video quality is poor and the guy explaining the technique kinda jumps around. He starts from inside the FG and explains how he discoverd the transition when he was going for a Toe Hold.
Then he suddenly jumps to Side Mount and demonstrates a couple things there before he jumps back inside the guard. In spite of all this I had to put this one on the site because of the innovation.
I am personally going to work on adding this transition to my game. I don't like Toe Holds in general because you have to try to break the persons foot to make them work but I like the idea of using a Toe Hold as a setup for the transition to the Truck.