For me this has translated into a Yugo SKS (picked up back when they were REALLY cheap) with an aftermarket stock, bayonet removed, an aftermarket muzzle brake, nylon sling, and an in-expensive red-dot. The 7.62x39 round in a 10 round magazine fits my requirements. If it should turn up missing or at the bottom of the lake, no great loss.
This solution may not fit everyone's requirements for a Truck Gun, but it is great for mine.
![tiphat :tiphat:](./images/smilies/tiphat.gif)