Agree w/ Corprin, one needs to avoid zinc fumes when welding.
I also thought about cutting those last couple inches off to remove the old welds.
Find a piece of rectangular tube that works with the current bunk mounts, cut to fit between rails, grind off zinc under weld area, weld in, drill for bunk mounts, paint, replace mounts.
The new piece could also be made to bolt onto the rails instead of being welded to them.
This would be a two-beverage job at my place...first one while we scratch our heads and figure out what to do and the second one after the work is done.
Yes, but friend just picked up an old VW bug and he’s got his hands full restoring it.I see you also have a case of friendwithwelderitis.