Well, I played with these picture a bit with a graphics program to see better and have a few conclusions that are still guesswork...
1. I don't believe those are guard rods by the wheel. I believe they are just levers that have fallen down against the wheel. I believe there are two of them to allow for a longer travel like pull one part way then grab the next to go farther... ?
2. If you look at the crossbow shaped piece that would be roughly opposite the base of those levers, maybe a pivot point? I think that the crossbow piece is part of a chain or cable lift much like IHC used on some of their sickle bar mowers. The chain/cable then would have lifted by running to the pulley on top of that pipe with a pulley then down to the pipe frame below.
3. I don't believe that was a drive shaft to the front but just a frame for a an angled blade.
4. That is the same power unit I had on an old IHC hay baler.
Guess... I think it was a ditch filling rig made by a ditching contractor to backfill trenched ditches. Probably an angled blade on the front to take off the top then a powered unit to push the rest of the dirt over to the ditch. Trying to straddle a ridge of dirt would be a possible reason to have rolled over and bent the canopy.
That is my guess which I am positive is correct unless it is wrong...