Youíve been given a lot of good tips and tricks here. I wish I could tell you one little thing that would miraculously work every time but there is not. Experience is the only thing I know that will help. I retired from trucking with almost 40 years. Some of it cross country and a good bit of p&d (local pick up and delivery). When backing, only 2 people exist. You and your designated spotter. Any time you canít see your spotter, STOP. Any time you are not sure about anything, STOP and get out and look. Iíve trained a good many drivers over the years. Back 6-8-10 feet at the time and see what is needed to correct it to what you need. Then do a little more. There is no dishonor in having to pull up or rethink what you need to do. I use my spotter (wife)to watch the trailer and stop me if Iím getting close to something I canít see. The difference in length is what is messing with you but itís actually only about half as much difference in the wheelbase. The trailer tire position is what you need to watch. Thatís the pivot point. Let your spotter watch the trailer. Everyone is trying to help by giving tips on what to do but until you see the situation and know what corrective measures are needed, you need to keep practicing. Iíve had good and bad days. One day I canít miss, next day nothing works. Donít get aggravated. Everybody has to learn.
Always at home regardless of where we are