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You are more likely to do more damage to the car if you are hit from behind if you have a tow bar fitted , the bumper is ment to cusion the impact but it cant with a tow bar fitted so the full force of the inpact is put straight through the tow bar to your boot floor pushing it up /forward
Chip
If you want to sell the tow bar perhaps you could drive it over to me and I will have it professionaly removed for you - and buy it from you as well.