As to the size of the brush cutter, how many acres do you plan to mow with it, and what kind of material? I've mowed a 15 acre field in about 7 hours with the
L3400 and a 5 foot cutter, what I'd call moderate grass and weed. That was in 1 or 2 high, which doesn't translate well to HST speeds. In any case, moving any faster would have been a poor cut job.
The 3800 HST has 31.5 HP at the PTO, I believe, so with the 3400 DT having 30 they aren't that far apart power-wise. Mine will mow heavy meadow grass in 3 low range without too much effort, but it's definitely loaded. A six footer might be too much mower in heavy going, I don't honestly know.
My main concern aside from available power would be the weight of the cutter hanging off the 3 point arms. My 5 foot Land Pride 1860 weighs 660 pounds, and the
L3400 wouldn't want too much more hanging back there over rough ground. 700-750 would probably be ok, 800 might not be so good. The 3800 has the same lift capacity on the 3ph as the
L3400, as far as I know, and weighs slightly more, I think. I do mow with the loader removed for better maneuverability, it would be a counterweight if I left it on.
The bucket: I opted for the pinned bucket as opposed to the quick connect, and there have been times I wish I hadn't. You'll gain the weight of the bucket in lift capacity if you can remove it, which is at least 300 pounds. If you plan to use a set of forks or bale spear, it's easier to slide two levers than remove 4 pins.
Anyway, my :2cents: has been duly offered, enjoy the new tractor !! We're wishful of lots of detailed pictures of things like the dash, control layouts, etc. The online pics aren't that great, so we're waiting for a new owner to take pity on us. And TEG is looking for an online manual for the part numbers for the 3 point valve.. I just know it..
Sean