I've used pallet forks to move the few rotten mulch-type bales I've had around here. Do you have the LA463? If so, that bucket is not QA; if you find a spear for it, it'll have to go on the front of the bucket, and that's a really long moment arm for such a weight. A couple of the heavier bales I've moved have really made my tractor lean forward, and that's even with the heavy backhoe attached. I wouldn't consider lifting a round bale without the hoe on.
If you have a hoe or some other heavy counterweight for ballast, and you don't have many bales to move, I'd recommend clamp-on pallet forks. If you don't have the ballast and/or have a lot of bales to move, you probably should consider doing the 3-pt hitch spear.
Let us know what happens. /forums/images/graemlins/grin.gif