You could get salvage ones perhaps, but you won't save much that way either. The big hit is really the labor. I was told to expect to pay about 5k to 6k to replace three front segments from a '67 caravel
. That was Sierra trailer restorations if I remember correctly. Replacement requires that you remove the interior end cap, which is not a small job in itself. You almost have to gut the front of the trailer to get to it.
If the picture you posted is your Caravel
it doesn't look bad. I would get in touch with a paintless repair place and see what can be done. You could cut holes through the interior end cap below the dents, roll them out from the inside, and then patch the cut pieces back in with fiberglass cloth and resin. That would keep you from having to remove all the interior panels to get at the end cap.
Best to you,
Rich the Viking