I do a lot of logging activities with pallet forks. I have the Frontier 42" fixed tine forks (they slide back and forth). I can pick up a stack of logs or just one really big one, no problem. I don't see any reason to go light duty since most of the weight is right at the attachment point, unlike a bucket with teeth.
Usually I put them at their maximum width to balance longer logs easier - even up to 40 foot long logs - with my 2320/200cx loader. I figure I'm still lifting at least a 1000 pounds of logs with them tilted back a bit so the logs roll towards the tractor as much as possible. Plus with the pallet forks you can move pallets. I get free 48x48 pallets and stack them with firewood 2 feet high - that's a quarter cord - and then you can stack the pallets on top of each other three high for storage. You can't move 3 at once since that is too much weight, but two at once with softwood is no problem. Wet maple I can move one at a time. As it dries you can obviously move more.