If the tire /wheel centerline is outside (wider than) the steering axis through the ball joints it will dart at the point where power exceeds available traction. I have never studied a 1ton up close, never worked on or driven one, and don't really understand the reason for the big spacers. I'm just making the stearing axis statement based on photos. I know it increases the load on the Tbars with a longer lever arm effective length, so someone please prove ne wrong.