Smartest solution to this trailer redeck problem I've heard out of all these projects on RU-vid. No way that little piece of flat iron is going to compromise the integrity of the trailer. Gentlemen this is a perfect example of not "going around your ass to get to your elbow ".
I cut my angle iron for my 4x8's however, I am having a very hard time sliding the boards. The new wood is thick and barely fits. I'm using a hammer but still they just don't want to slide very well. I'm worn out... I'll try another day that it's not 100 degrees outside.
I just got done doing the exact same thing. The old boards were nailed like yours. I took a hole saw and cut off center around each nail. popped out the wood around the nail that was still sticking up, cut the boards in half and removed them. Then, like you, I used a grinder to cut off the nail tops. Yes, they used a gun to shut those nails in. The force and speed almost welds the nails in place. Cut the front top angle just like you did and now I have all new wood flooring that is smooth, straight and all edge glued together. I keep my trailer inside which will minimize any water issues that can occur if a trailer would hold water. Thanks for your video and idea. I was going to do that, but you did and a great job.