swing arm brush cutter

[johndeerefarmer]

I am looking at either a swing arm brush cutter for my Deere 329d compact track loader or buy a Deere 35G and put a brush cutter on it.

I mainly need to keep the trims trimmed on our 800' driveway and mow the grass along the driveway, pond banks and around fences.
My questions concern how beefy these mowers are. My 329d weighs 12000 lbs. If I happen to catch a large limb I think it's gonna bend the arm. Most I see are only 1/4" steel.
The Eterra has 1" steel in the arm but is $31,000
Not sure what would happen if I caught the brush cutter on a large limb- would it swing the machine around or would it bend the arm?

 

[LCCorp111]

I have about 1600' of bushy tree line I would like to trim up about 3' or 4' to keep the critters from hiding. I also need to trim a lot back, to try and make it straight and easier to mow the lawn. I have a Bobcat S300, but I really don't want to tear up the grass by turning and maneuvering around. I am looking to purchase a Deere 60G or a CAT 306, and I was thinking of buying a hydraulic sickle bar.

Do you think a brush cutter would do a better job? The sickle's I have looked at I think were capable of a 2" branch??? I figured that can trim the heavy grass on the ground and the hedges up higher.