I have added extra reflectivity to my boat trailer with the same reflective tape you see on semi trucks. This tape is D.O.T. approved and rated. It is as bright as lights when vehicle lights hit it. It is pricey at roughly $1 per foot, but well worth the investment. I think it has a great advantage of visibility for those boat owners who have no other option to park their rigs except next to or close to a public street. Many people who live on lakefront property quite often have little distance between the house or cottage and the public street.