JSM, I do not believe that Ford forgot to install it, rather the bolts were not tightened down sufficiently, or were loosened by the coach builder and they failed to re-tighten them. This has been an ongoing problem with the rear anti-sway bar on some Ford 22K chassis. You did not advise what year and brand motor home that you have.
If your rig is still under Fords warranty, they will either send the bracket and bolts to you or to a Ford dealer of your choice. Ford did exactly that for a friend of mine. May I suggest that you search the Ford forum on IRV2 for additional information. Also you said that Ford tech noticed the missing bracket and bolts; he should be able to order replacements.
2012 Tiffin Allegro 34 TGA
Ford V-10 22000 lb chassis
Brake Buddy Advantage,