Lots of good ideas and suggestions! It all gives me hope that I'll actually get this done in my lifetime!
Just for the record, here's a pic of the trailer as it is now. Pretty sad shape, huh?
I started pulling the first board off yesterday evening. Spent maybe an hour and a half doing it before it got dark, but most of that was standing around scratching my head and doing lots of looking and thinking. My starting point was to bore a 1" hole about 3 inches from the aft end of the middle board. I then took my sawzall and cut from the center of the hole to each side of the board, effectively cutting about 3 inches off the end of it. I then took the angle grinder and cut off the heads of the first three Torx screws from the end, then got the prybar out and started prying. After a few minutes of prying, I had it off. The reason I chose this board is because it was only about 3 inches wide so it was easy to get off. I think when Diamond C builds their trailers, they install boards on the sides first, then work their way towards the middle. When they got to the middle of this one, they had to rip a board in half to fill in that 3 inch gap. Here is a picture of my arch nemisis in all its rusty glory:
Will start soaking these with PB Blaster and then see how hard it is to back them out (if it can be down). I will probably break (or cut) the bottom part of the screw off so I won't have to unscrew it all the way. Should have taken the pic from the other side, there's about an inch protruding on the bottom side of the angle joist. I guess these are 3" long TORX screws.
Below is a pic of my other arch nemisis I'm up against. This is the trailer's frame where the boards fits into a C channel at the front of the trailer. It has the same design on the aft end. I think when Diamond C installs the decking, they lay the boards in and then weld 2" wide metal strips on top of them to lock the ends in place. Easy for them, PIA for me! This means I'll have to actually bow the boards in the middle to get the new decking back in. Well, the first few boards I might be able to slide them in sideways, but at some point once it starts to fill up, I'll have to start bending them. No idea how that will go until I get there, but I'm a long ways from that point.
So, I'll just work at this in my spare time in the evenings and some on the weekends till I get all the boards off. Then, I'll pull it to the guy who's going to paint it for me. A trailer with no deck on it should get a few double looks!!
After it's been sandblasted, primed, & painted and I get it back, then I'll deal with getting the new boards back on. One thing for sure, I won't be using TORX screws! Someone suggesting using carriage bolts, I do have a bucket of them in the garage. If they are the right length, I'll use them instead. That will save me a few bucks on this job. I'll post a pic or two when it's all done. Thanks again!