You can buy this truck off the internet. If you wanna bypass the time sesrching for it. Or just go to the pier and its always guaranteed to be there as well.The Sandking shows up quite frequently in Blaine county on my game.
I found the vapid sandking location
Sorry for upsde down upload half way in
The one off the internet is a 4 door crew cab there is an extended cab version that does not have 4 full doors