I inquired about the multihog at the dealer and was told they do not do well with rocks. That was disappointing. The sales rep recommended the Norco rock crusher but from the short video, it seemed to vibrate the heck out of the host machine and let a lot of stuff fall through that was bigger than the advertised 2" or minus.
I've really been thinking about some type of small crusher but if one like the hog isn't good for small rocks, then I'm left with the rock crusher attachment by FAE or similar manufacturer and I don't think it would be as versatile and will use a lot more fuel.
I was on a job site today where there was a lot of loose rock in a dry creek bed. That material would have been good to start the gravel road if it was crushed. Still looking.