Sanguine
Neutiquam erro
For protecting your car cosmetically it's all well and good. But when you sustain a larger hit it works against the crumple zones, a towbar will compress a matter of angstroms as compared to the centimetres that the crumple zone would. The net result is that the G-loading on the occupants is greater (i.e. more damage) because the same force is acting over a shorter distance. So it's great for shrugging off fender benders, but up the stakes and you'll find yourself in a world of pain. 
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