That's good to help you align the hitch when you're hooking up the trailer (and don't have a helper).

I don't think it would help much with backing up: since it's right at the hitch point, it will always be more or less in the center of your view no matter what the trailer is doing.

I second the idea of a kid's bike flag, long fiberglas rod with a day-glo orange pennant at the top.  Either one at the center-rear, or one on each rear corner of the trailer.

Allan

On Mon, 28 Sep 2009 07:32 -0400, "Kenneth Lewis" <kdlewis@NORTHSTATE.NET> wrote:
> Here ya go:
>
> http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=95684
>
> Let me know how it works.
>
> Ken