Mirror trick
We have a 1998, 26rd. Tow it with F150 supercab. Bought a set of extension mirrors at Camping World. Not sure of the brand. They work great, however with the plain flat side o the trailer plus length of truck was hard to tell where the end was. Ah Ha!, I add two compression springs, painted orange at a spot under the plastic tray and onto the frame. Now I can see just where the end is, plus it is not a knee knocker. By the way some fire truck makers are adding a rear mounted lighted "curb feeler" for the same problem.