TRAILER BACKUP FLAGS
You can solve the excruciating process of backing up a trailer by yourself with two flexible flags (remember those oldschool flags you used to fly proudly off the back of your bicycle?) and a pair of magnets. Find bar magnets online. I bought two 3-packs of them for about $5 on Amazon. Use five-minute epoxy to laminate the magnets together. Next, smear epoxy on the side of the magnet stack, and press one of the flagpoles in place. Repeat with the second set. To use, simply place a magnetic flag on both the trailer tongue and the hitch ball when you need to back up. Now you can line up your trailer without leaving the cab.