Not that you asked...
The picture of the failed support looks like it has a bow in it that may have been there previously? If the support had even a slight curve before the accident, that would explain why it failed. The supports are under compression so the forces need to remain in column.
After seeing your failure I'm going to inspect my supports to be certain they are completely straight.
Other than the extra weight, a stiffener can easily be added by clamping proper sized angle iron or aluminum angle to the OEM supports using worm drive hose clamps or possibly use stainless steel picture wire wrap to marry the parts. At minimum, clamp the angle using a clamp at each end and one approximately in the center. Actually filament packing tape would be easy and strong enough as long as it is replaced if it shows signs of wear.
The closer you get to the ends the less the additional support is needed. As is shown by your bent support, the stress gets more critical in the center.
It would be a shame to scrap out a good trailer for lack of replacement parts. I haven't seen the damage. A good metal fabricator may be able to straighten the bent rails or copy the shapes for replacement if it turns out parts are not around. The originals are likely aluminum. There is no reason except possible higher weight that the copies can't be galvanized steel.
Originally Posted by thezems
... So far, it looks like the only part jayco does not have available is the support piece which caused the issue. ....
A couple of our 2001 galvanized bed supports have a bit of surface rust. Should the paint I put on them not last my plan is to fabricate new supports using 1/2" EMT electrical conduit tubing. I haven't specifically checked to compare the strength, but it looks to be similar and will be strong enough.
Another option would be to use 3/8" schedule 40 galvanized pipe. The 3/8" pipe will be overkill and heavy, but may help your wife to feel more confident.
The 3/8" pipe cannot be just flattened like the OEM to form the tab ends to fit into the receivers. The pipe end cross sections could be cut to form the tab. Once the tab size is cut it will be easy to form the tab to fit into the receivers. The single tab made from the schedule 40 pipe wall will be plenty strong. Some pipe wall curve can even be left in the tab. It doesn't need to be pounded completely flat as long as it fits into the receivers.
My method would be to copy the OEM supports leaving the end tabs a bit long. That way after they are formed, the tabs can be cut to length for a more exact fit. That should make fabrication/copying a bit easier.
Good luck. vic