Having towed boats and other trailers starting at an early age the only thing that I do is adjust my bubble mirros so that I can see the back truck tires where they contact the road. That way I know how far the truck is from the edge of the road or curb, then I can guestimate how much of a wide turn I need to make it. I can usually see the trailer tires easier this way as well. Different strokes for different folks, but thats what works for me..... oh... and swing wide! I also have a nice set of two way radios when backing into campgrounds, its easier than reading my wifes sign language!
