A bent axle from overweighting an a-frame would be pretty unusual considering how much cargo capacity there is and how little room there is to put stuff. I'd have it inspected by the dealer or an independent trailer service center to figure out the problem. Afterall the axle is not an RV specific part. If the axle is bent, it may not be too much more to buy a new one than to do a repair, considering labor.
The assets of AL-Ko Axis, that division of Al-Ko that manufactures these axles has been purchased by Dexter. Often when these purchases are for "the assets of" is means there was some substantial problem with the original company. So keep that in mind when consulting the service center.
The AL-Ko Axis Corporate office number if you want to talk to them is 574 - 294 - 6651.