http://www.britishpacific.com/BPSite...ingLadder.html
Yeah, a sand ladder is just for traction in loose terrain, same concept as stuffing a floor mat under your wheel, or piling up rocks, etc... A bridging ladder can be used for this, also it can support the weight of the vehicle so if there is ditch you cannot drive over, use the ladder, or if you're trying to go up or down something vertical, you can use it to sort of form a ramp to assist in the angle. I think they're just another tool to carry, and more than anything I would only be interested in makeing my own, on the cheap. The link above the aluminum bridging ladders they show there are $455 for 2. Thats a wee bit to steep for me.