Most often it is the drivers natural response to want to hit the brakes. And this is what causes those spins. The uneven braking and traction on one side coupled with the movement (if any ) of a tread separation or blowout...leads with the wrong response to a spin.
Stay Off the brakes. give ;yourself a chance to slow down a bit then apply very light pressure to the brakes.
In some cases it might be that you actually have to SPEED up a little to offset the movement cause by the blowout, once straight come off the accelerator and slow down then begin braking lightly.
Much of this is simply driver error or inexperience with large vehicles. (and sometimes small ones)