I would bet your actual dry wieght is within a few hundreds pounds or less of you axles limits. Add a few common items and water and your well over.
Yes, your axles were undersized from the factory. This is something to look for when you buy (bet you will next time!). I wont buy anything without at least 1500# of CCC and preferably 1 ton. My last TT had 3900# of CCC.
As I wrote in your other post, upgrade them to 5200# (or 4400# if your concerned with ride) axles and your good to go.
Oh and they're not worn out, they're bent from over loading.