Let me rephrase that. It would not pass a 5,000lbs pull test as it was built back then.
Yes, we did find a way to add the seat belts back there, but that required us adding backer and more framing inside of the slide floor. Just bolting through the slide floor was not going to pass.
Personally, seat belts in the living area of RV's to me are just the "politically correct" thing to do. Frankly rear facing seat belts, side seat belts etc I think are just to make some people seem safer. Back in the day we would all ride in the back of trucks, ride in the truck camper laying in the overhead bunk looking out the windows (front and side), we never had seat belts.
PLEASE do not send questions via Private Message, my inbox fills up too quickly. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).