Gary. They will never be 100% true again and they will be weakened but you can normally get them close enough that you will not notice.
I have straightened a lot of axles over the years. It takes time to get it very close but you can do it yourself with an extra pair of hands and/or weight. All you need is a marker pen, a straight edge, an axle stand and a short length of scaffold bar. Remove the wheel, hub and sprocket carrier. Place the straight edge across the side pod an the rear bumper as a firm datum line. With the marker pen perpendicular to this line just above the axle get your spare pair of hands to spin the axle. Slowly lower the marker pen towards the axle until it marks the high spot.
Place the axle stand on the chassis directly under the axle and jam the other end under the trailer and/or get your assistant to place as much weight on the other end of the chassis. With the high point mark facing upwards slide the scaffi bar over the axle just short of the bearing carrier and apply leverage. How much will depend on the softness of the axle and the severity of the bend but start with a little and remeasure/mark with the straight edge and marker pen and adjust the amount of leverage as necessary. Doing a little at a time and you can get close.
Once you have done this once or twice you will get a feel for it.
Graeme
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