The first year the truck debuted they cycled the drivers that were at the same event it showed up at, it was pretty obvious who was driving it during that time because trucks that generally went last would go out 4-5 to last or even earlier.
For the following years after, the driver has been the same during the first quarter (January to March) but has had different drivers for the the World Finals (including the Doomsday only encore). The regular driver in question is pretty easy to figure out if you think about it (World Finals XV Young Guns Shootout). It also had a different driver for the POD tour last year and again, it was obvious it was if you look at the truck and lineup for the shows.