The advantage of having a full float rear axle over a semi-float is that the full float has two bearings at the end of the axles instead of only one. The two bearings have a higher load capacity than the single bearing, & also prevent the wheel from falling off if the axle breaks.
The full float that fits your Land Cruiser has the same specifications as the 45 & 47 Series 1 ton Pickup, while the 60 Series full float rear axles have the same load capacity as the 45 & 47 Series 1 ton Pickups. Not to mention, the 1976-1990 front inner & outer bearings are the same as the full float rear ends, this means that the bearings are standard from the left to right & front to back wheels. Ponder this: Does this mean that you have a 1 ton front end?
For you V-8 guys who insist on busting up those differentials, you should consider upgrading those semi-float axles to full float axles. With full floats, if you break the axle, just pull it out & remove the driveshaft and it becomes a 1 ton trailer axle!