Do you need things for your vehicle? If so, go ahead and make a list, numbering them in order of most important. If you use it to work and you need to cart around a lot of tools, then a truck toolbox is going to be pretty important. Ben Franklin always said that the best investment you could make was on the tools of your trade. You may or may not need an air horn for whatever reason, but chances are it isn''t quite as important as a place to keep your things.