I actually do more trail maintenance/building than hiking these days, what a great thread!
Those Fiskars PowerGears are really great, you can cut through limbs with much more ease than a comparable sized regular lopper. They come in just about any length you could want too, including pruners. Right now I just have a long pair of Corona loppers (32" I think). I don't really like to bend over when I'm carrying a pack and the longer length keeps me from having to bend over to lop things off at ground level. I have no idea what the weight of the things are.
As for saws, I just have a little Fiskars folding saw I got at Home Depot. I don't know the model or how much it weighs, but it works ok. I bent the blade a little shortly after getting it and now it cuts with a slight curve. Maybe its time to replace it…
Personally I would rather carry a longer pair of loppers than a machete. You can do a better job of cutting the limbs off where you're supposed to with loppers. If your section of trail has lots of small plants/weeds that grow up around it, though a weed whip is a better choice. http://tinyurl.com/weedwhip Most of them will cut through saplings even. A word of caution, if you have a lot of whipping to do wear a pair of gloves because it will give you blisters in a heartbeat. Other advantages include being much lighter and easier to pack than a gas powered Weed Eater and you can actually use them in Wilderness Areas.
Keep up the good work. Let everyone else think the trails are just made by lots of people walking in the same place. We'll keep all the real fun to ourselves :P.
Adam
Edit: Just saw your comment about a hoe. It probably varies depending on the organization your adoption is through, but on the Ozark Trail adopters are not responsible for tread work, so no hoes are needed. Tread work is really a whole different ball game than lopping and trimming. I would check and see if fixing the tread is part of your duties before you start dragging a McLeod with you.