not sure what kind of golfer you are, but the shaft, if metal, is so thin that over the years of cold then hot (like the back of the truck) will make the metal weak and break. if you get new clubs every 5 years it doesn't matter, but I always keep my mp-14 in the house unless I am playing that day. pad lock and hard case might be you best way to keep them in the back of the bronco.