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Servis-Rhino makes them in that range, but they are expensive, never looked at the Bush Hog line up, would think they might have them that would handle 4" brush. Finding a used heavy duty one might be difficult. I saw something on the photo ads here Mfr. was "Brown" small and heavy duty, would handle that diameter, was like $1200, but you have no idea what it's been through and what repairs it needs, looked in good shape and that is a reasonable price for what it does. Really a gamble when you get a used one, they have to put up with some real abuse, and do need a lot of HP to run in heavy brush. 
Your terrain is similar to what it is like here, but I wonder if the brush is like what we have, really young trees, hardwood, blackberry bush, thorn bush, and similar are easy to deal with but when you start getting into small trees, it becomes nasty work with a regular tractor, open station, smacked in the face, poked at, impaled, dodging things flying out from the cutter on occasion, just really nasty work, best done when the ground is frozen and things are a little more brittle. Maybe you have experience and know these things, but if not, also consider the tractor you are going to use, and safety like a roll over protection structure, seat with seatbelt, etc. Without a loader to knock these 1" trees over here first, no way the cutter would deal with them, I raise up and then set it down as I pass over the heavier material and it sounds like you ran over a landmine. Also fun when you hook on to a tree with the cutter deck or a tire starts riding up one bent over, well you probably get the point or know this already. I mention it because a neighbor on the other side of the hill got bounced off a tractor and under the cutter, doing the same kind of work in nasty conditions. A small dozer with a brush cab might make short work of this, or another similar piece of equipment like what the forestry company use, but probably hard to find in a rental fleet, if the brush pops out easily, you can clear and stockpile quite a bit in one day, not put your tractor through the abuse and subject yourself to the hazards. I like renting when the job requires something specific to be productive and safe. Money well spent. I've cleared land both ways, dozer wins hands down when the brush is heavy. Also know the terrain, surprises can turn a tractor over, and down there, I cannot imagine what the bees and wasps and other insects are like, well enough lecturing, it's nice to look back when you are done though, looks so much better cleared. This thing will take up to 8" trees, but not hardwood, it tossed a firewood size chunk of cherry towards me 100 yards away, from a cherry tree. These made short work of clearing though, hydraulic pump that drives the cutter is like $10,000. 
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