Wellllll.....Here's the deal. We ALWAYS have the stokes onboard just like Grant said, and it's usually secured to the forward lower portion of the internal Aux fuel tanks/bin. I've seen other units actually store it attached to the cabin roof just forward of the tanks, but personally I think that limits more movement in the cabin. Grant is also correct in that we usually secure the objective (patient/survivor) to the Stokes and utilize that rigid structure to isolate movement.
Now for the good news bad news. Yes we sometimes also carry a backboard, but after looking at the AM one Gino has, it's not exactly the same. The one we carry is a somewhat shorter more compact version. Basically it's the length of a human torso with head. Normally when it's used it is in conjunction with a Stokes, but more often the Stokes is used by itself to transport/hoist/secure survivors. It's hard to say exactly how much shorter than the full sized AM version you have, but it is smaller and shorter. Now does that mean you could use the AM backboard with some modifications...sure. Could you use the one you have....probably, but since you asked for the straight gouge...there it is.
It is a damn good looking backboard.