I did year of forestry in New Zealand, pruning plantation pines at heights up to 6m (20') taking off every branch with loppers. The cuts all had to be collar cuts with no damage to collars, and branches were up to 2" or even a little over. We got paid $1.20/tree for each 2m of height pruned. You only prune 2m of height off a tree in one pruning, so that's $1.20 per tree.
A 200t just couldnt keep up with this work, even if it never needed sharpening, refueling or oil. The lopper we use were made by levin sawmakers of NZ. Their standard model is rated for 2 1/2" and they also make a heavier duty version rated for 3 1/2". They aren't kidding with their ratings, and I've taken branches outside of the spec on a daily basis with these loppers. They can't be broken, even by Maoris on crystal meth with arms as big as my thighs.
We were pruning 200 trees a day with these, 5 days a week and you'd easily get 5 years out of them before replacing the blades. They cost about $165, and are worth every penny. Get the leather pouch with them if you can. I've owned most types of loppers including the fiskars. The fiskars are nice and light, but they aren't anywhere near the levin loppers. Lots of people sell Levin loppers in aus, not sure about stateside.
Shaun