What B2710 said. The 60" bucket is a light duty / light material bucket. It isn't designed for heavy digging, but rather for moving mulch and landscaping materials. The 54" bucket on the LA535 is plenty bucket. I've had no problems covering track when back dragging, but that's probably a lofty ambition even with a 60" bucket. The track of the rear wheels is 52.5 inches, but outside to outside of the tires is more like 65" or 66" inches.
If you fill the 54" bucket with wet clay, you're gonna have just about all that LA535 wants. 535Kg or just under 2600 lbs is all it's capable of lifting, including the bucket. I don't remember the weight of the 60" bucket, but seems it was nearly as heavy as the heavier duty 54", that too being for a reason (lifting capacity). Seems it would be a little easier to overload the LA535 with heavy loose material. I moved about 25 yards of loose screened top for my neighbor. Even a bucketful of that is HEAVY when it's damp.
If you want it to dig, you're going to need a tooth bar, even with the 54" bucket. Unless I had a backhoe, I don't think I'd take on a major digging project with the LX2610. If you're concerned about grading and smoothing and hiding your tracks for appearance, then certainly a 60" box blade, or even a 72" (behind the tractor) would be the better choice. My fat R14's are aired up to factory spec, and even a 48" box blade seems to cover it's tracks pretty good. Then again, I've typically used the loaded tires for compacting after I finished grading because I've usually dug a bomb crater with the stump bucket. Out in the open I rough stuff in with the bucket to knock down high spots, but correct it with the box. That's starting to make me wish for a backup camera with my old back and sciatica, but it certainly makes for better finished dirt work. I'm not sure why covering tracks is important when grading or digging. 10 times out of 9, you're gonna make more tracks by packing/tamping, or you're gonna dig up the tracks you just made. Just my opinion, though. If I were tilling or gardening where I didn't want to leave compacted soil, oh yeah, I get it. In that case, you want whatever is chewing up the soil behind you as well.