Do you have a decent trailer shop anywhere nearby? I would highly recommend you have them look at it. They can do it, and do it right, with one hand tied behind their back. Depending on your axle and their capabilities, they may also be able to straighten it back out enough to get you by until a new axle can be made or ordered in. Otherwise, I'd have your dealer do it, but that might take more time. As to who makes the stock axles, my guess is that FW makes their own using bulk stock and the spindle & brake kits they buy from Tie Down Engineering.
When you have time, please tell us how this happened.
