Leveling Just One Axle

During the last year I have seen a couple of different cases where people level a double axle trailer by placing blocks under just one of the tires. It looks rather odd and as a matter of fact this is what caught my eye. Other than being easier, is there a good reason to do this? And, perhaps more importantly, can it do any harm?



I just saw a thread on a SOB forum and no one seems to know if it is damaging or not. One person said something about it being OK for regular axles but not so good for the torsion types. Any enlightenment would be appreciated. I am specifically looking for the prospect of damage.