Yes, I have seen it in operation with CVR(T) vehicles. Not elastic in the sense of rubber, it is plaited nylon which when stretched stores up considerable energy. The way to pull out a stuck vehicle is to attach the rope and lay it zig zag in front of the casualty, back up towing vehicle and connect. Take off at a rate of knots and when fully stretched, I think the driver feels this point as it happens, you stop dead and hold the brakes on, the stored energy in the rope then pulls the casualty out. Very impressive.
Mention is made of using one of these ropes on Land Rovers, etc. The amount of energy in a CVR rope is probably to great for safety and I believe the makers, Marlow Ropes, developed a smaller rope for this purpose.
Richard