Arty,
Prentice is a very popular loader, every tree guy I know that has a loader has one , myself included. A Prentice loader is good only if your moving 4'ft. and longer lengths or big diameter wood, cut to 3 to 4 ft. lengths. Hauling brush with a Prentice is a going to be a divided issue, around here one guy hauls all his tree debris with a Prentice, the others and myself chip as much as possible because of dumping and burning issues that are associated with hauling bulk brush and logs. Dump beds and extendable booms are really nice features for a loader.
If your friend is just looking for a boom to pick up pieces that 2-3 guys would have a hard time lifting and isn't interested in clamming brush, I would go with one of those figure 4 cranes ( Hi- AB ) that mount behind the cab along with a dump bed if possible. Some thing like this is easier to keep up with when it comes to money and maintence, than a regular log loading truck.
Larry