Which is probably why you don't do it !
I, on the other hand have never had a problem with it. I use a jack adapter in the crossmember or front hole and a bottle jack under the axle, remove one wheel and lower the axle, jack up crossmember, *SECURE THE HANDLE*, remove the now free spring and insert replacement, lower the hi-lift, jack the axle back up, refit wheel. Repeat. Easy and saves all the palaver listed in other posts and no lying on the ground under the vehicle removing Radius arm bolts !
Works for me but can't say for other people as it's dependent on your own level of intelligence.
It's the only practical use for that big lump of useless cast iron that I've ever found.
HTH and clarifies
Mo