I'm curious as to why people use hitch covers (the ones used when on site). I'm not criticising anyone for using them it's just that I can't see the purpose myself. If they are to protect the hitch from getting water in then there doesn't seem any point as the hitch gets a good soaking when towing in the rain. If it's just to smarten up the hitch area when on site then fine - I can appreciate that some people might want to do that. Is there a practical reason I'm missing?