Logging trucks around here are all tri-drives now. Lots of crane trucks and some gravel trucks are too. I know of one farm that is using a couple of them for silage. They are all powered axles.

My cousin works for this outfit, it might be him.

 All silage trucks around here have always been floor chain too.  There is no grain grown around here so we don't need hoists, and most bunkers have a roof.  I couldn't find you a hoist dump silage truck if I tried.