I really don't think many people cruising around in new trucks would have the money to write off a totaled one that went through the ice, most would have to default and let their credit be ruined for a few years. That's the way things are now days.
Look at it another way. If a 50 thou vehicle gets sold on credit a comprehensive insurance policy is required. This is partly to recover the money should the vehicle be destroyed. A destroyed vehicle is a destroyed vehicle whether it falls through the ice or it gets hit by a train.
I realize that the vehicle needs to be paid for, I have a hard time believing that any insurance company would pay if a vehicle is operated off a legal roadway? basically if I bought a new vehicle and realized I can't afford it I can push it out on thin ice and let the insurance company cover it? if in fact it is true that they are covering vehicles operating not as intended ie on ice or off road that might explain the high insurance rates?