I admit that I really ate crow on that ordeal. I stupidly thought that 2 of the 10,000 pound rated (that's what it says all over the straps) 2" wide straps on the front and 2 on the rear of a Kubota L5030HSTC would be fine. After the incident, I felt like I needed "moron" tattooed on my forehead.
No strap was even close to a edge and the front weight bracket (with no weights on it) made for a great place to place the hooks on the front and the bottom of the hitch plate on the rear worked great there. I'd done the same thing for years without incident. It was only when I went to a friend's office who owns an engineering firm that he took the time to 'splain things to me. In his professional opinion the dip in the road caused my 7k trailer to flex, putting slack in the straps as the trailer actually moved up on both the front and rear and then snapped back in place. That shock load was, according to his calculations based on the construction materials used in my trailer and the weight of my load, enough to have easily snapped 3 of those straps on either end. He politely called me a lucky fool and, as you can read in the other thread, I promptly not only immediately purchased all grade 70 US made chain and binders, but bought a trailer with more than double the weight rating. I now only use those straps to hold down a finish mower or bush hog on the rear of my tractor to the trailer.
As an interesting point of interest, I did use half of one of the newer 2" 10k ratcheting straps to pull other ATVs out of the mud and snow. I don't know what a Suzuki 750 King Quad weighs, but it's nowhere near even the 3300 pound WLL of that strap. It maybe weighs, what, 600 pounds? Anyway, I snapped two of those straps with that Suzuki pulling other ATVs out of mud holes. If an ATV can relatively easy snap one of those straps, they definitely shouldn't be used to secure a tractor to a trailer unless you use like 20 of them!
And, yes, I admit that I'd have been a smart arse and argued that those straps would have been plenty fine, especially using 2 on each end. I count myself as very lucky that my ignorance on that matter didn't result in a life changing disaster. That's why I'm pretty adamant about telling guys what I know to be fact on securing tractors to trailers. Some think I'm nuts and act like I likely would have before I had that incident. As I stated before, if I can by chance save one guy from having a terrible accident, it's worth all the fussing. I can be disliked big time for my strong feelings on this issue, but if it helps someone, I'm okay with that.