If you are lucky enought not have this happen to you trailler, good for you. I finally figured out how to fix it without cutting the steps off and rewelding. I used a metal cutting core bit to drill the threshold center over the bolt. I used a dremel tool to cut the bolt off flush with the botton of the trailer. They used a carrige bolt into the wood floor of the trailer. I naturally just spun with a wrench on it. After removing a carpet - threshold protector I oulled the carpet out from under the threshold. There is about 5/8" between the threshold and floor. I took a floor jack and placed it under the step and jacked it up to flush with the torn angel of the step. I got a piece of 1/4" galvanized perforated angel and placed it outward of the step and inserted a Stainless Steel 3/8" bolt with 2 stainless 1/8" fender washers on top. On the bottom I used Stainless locking nut and Stainless Fender washers. I had to square off one side of the washer to make enough room for it to fit. I put 3 1/2" X 3/4" Stainless bolts into the steps and tightened. I then tightened the bolt thru the floor. It is now sturdier that new. I took a oiece of aluminum and bent it in the shape of a small channel and put it under the threshold above the bolt. I mixed up some JB Weld and put it in the bolt hole over the aluminum channel. I have to wait for the JB to dry and then I will file and grind it smooth. Put the carpet back in and vacuum and be done. Just my little fix for a bad step.
Why the used a carrige bolt instead of a regular bolt is a mystery. Thanks for looling.