I smoked a bunch of crack and now I've been thinking about how I could design a 12ft drum shredder that mounts to the front of the blade of my dozer with quick attach pins on each side.
I was thinking like two 9in drums running parallel horizontal with 5.75ft sections for a big carrier bearing in the middle. Spinning opposed to each other.
Chain drive on each side goes up to a input shafts which connects via driveshafts to a engine/transmission unit out of a small front wheel drive car. Utilising it's automatic transmission, it should be fairly easy to use as a power unit for this.
If I figure out speed sensors on the drums, I can use the engine ecu's cruise control to set the drum speed and it should in theory maintain that and raise/lower the throttle to meet load demand.

Is it viable to use two horizontal drums with overlapping feet to obliterate thick brush? The drums would spin to eject the mulch towards the blade I guess to get the cutting action, so there would have to be sufficient space for that to work. Though I would be able to put the transmission in reverse if chaff builds up I think.