OK, here's the thing, GRAB THEM !!!!!!!!!!!! the rear is bent. SO ? there must be a trailer mfg. somewhere near you. or if you have to, some heavy wooden "dunnage" (blocks) a couple of lengths of grade 80 or 90 chain and a 20 ton jack. form a "Truss" (A) with the jack on the opposite side of the bend, throw a couple of old sleeping bags over the entire thing (to slow the chain down if it goes). Time and slow adjustments, works every time.
We do heavy truck axles at work, we use a backhoe in place of the jack.
you might want to mount a set of rims (no tires) on the axles this way you can measure the outside top and outside bottom (sides as well) rim to rim, to determine the bend and how to move the jack around to straighten the axle tubes.
do NOT use cable, chain looses it's bang in a short distance, cable on the other hand, will whip... and destroy ANYTHING in it's path.
Time and caution will get it straight.
No disassembly required, use the area between the backing plates and the spring perch for the chain, the taller the "A" the LESS intense the pressure needed to bend. (and the point of fulcrum on the axle is greater, TAKE YOUR TIME).....
OH, BTW, the dunnage is simply to get the axle off the ground, it's NOT in the chain system.
Greg