Tony and John--thanks, I believe that is good information I will need and employ.
Any specific recommendations on kinds of straps? I have not looked for them yet, my friend might even have a set. However, I do see, on occasion, all manner of straps for sale at auto parts stores, home centers, Tractor Supply, etc. What should I look for?
Alfred, not to belabor a point but UHaul has always used custom made equipment--all of their trailers, haulers, etc. are all made specifically for them. So, what they show might not apply for the specific trailer I will borrow. What I was really looking for was information (thanks again Tony) about where on the W113 to use straps--information that Tony supplied quite precisely.