It's probably the same kind of thing as knives , all about the context. I have knives , hammers , screwdrivers and crowbars in my van all the time . They are the tools of my trade , joiner not housebreaker , so i have a context or reason for them being there. I suppose if there are any worries put the tape etc in a plastic box with a can of deicer and label it something like "Winter emergency kit" ?