Why do I need WD?

I didn't read every response since my first post on this thread, but has anyone ever considered that when the tail end of your vehicle drops a couple inches because of a trailer being hitched, it causes the back to lower ..... which causes the front to incline ...... Do you know what that does to your headlights and how bright and glaring your headlights become when that happens to on-comming traffic? Even a slight rise or lower on the headlight beam will cause your headlights to beam at a different angle, which could be extreamly dangerous for on-comming traffic. WD helps keep the vehicle LEVEL, so your headlights are not shinning at the tops of trees ....

It's just something to think about!