Well, the adjustability is the big thing with them to make them more than just pallet forks.
I've used a single center tine on mine to function as an attachment for a boom pole to install 21- 32' trusses for the pole barn. Setting up a six foot work platform for the trim the widest setting was good and stable. I've used the bare frame as a bushhog probe, in uncharted territory where the six foot bucket would peel off areas of sod--they scrape and bump but don't cut. I installed chain hooks on the sides and now implement moving is a snap--except for the logging winch and wood
chipper--they need a narrow setting to fit between the implement 'feet' before chaining on. A narrower setting works well to lift 4-wheelers up onto the truck for oil change and service (gets me off the ground!). The widest one is really needed to get the truck sander on and have it be stable for my tractor. I tried the single tine for popping stumps--doesn't work, but allows you the single center probe, which probably could make a narrow trench--a friend used his to install underground cable doing it & said it was a snap.
I bought removable and adjustable, because of the variety of configurations, support structure and compactness of the bare frame gave me options for putting the tine exactly where i wanted it, instead of having to bridge the gap or lay out a support structure onto fixed forks.
Cons--they do rattle and shift--they make noise when bare and on the move. You must keep the track clean and everything lubricated or adjustment is challenging, tines are heavy and awkward to move when detached, the bare frame is heavier.
I wouldn't look at a fixed set--forklifts have adjustment built in. I'd get removable ones too--whole setup can be stored in a 1'x 5' strip if necessary--they usually sleep under the winch intact though.
Weight rating will affect pricing, so don't get hung up on the 'strongest set' if your tractor can't approach its limit. They're on everything from 20hp-100+, so shop according to application. Good luck!
Sorry--you're looking for the three point set-up. On a FEL there's a bunch of uses--less so off the back.
