I ran a length of the D.O.T. standard red and white reflective tape across the back of our trailer to improve visability while riding down the road, and it works great. Never thought of trimming the edges, but I like the look.
I got the tape on eBay - it ain't cheap!
Bill & Kate - Stone Harbor, NJ
w/ Sunny (parti poodle) & Molson (goldendoodle)
2005 Ford/Quigley 4x4 E-350 Chateau Super Duty Van with 6.0L PSD ("Moby")
2012 Outback Super Light 277RL - 10th Anniversary Edition ("Salty Dog House II")