outside wall coming away from floor

Hi Bill

Thanks for the response. We think one of the causes is the roads we ride on. Pretty bumpy ...

These are self tapping carriage bolts so my husband isn't sure what you said will work. He thought about putting silicone in there.

Any other ideas you have will be appreciated.

You don’t give us much information to work with. What kind of motor home, year, model ect. The more info the better the answers.
If it pulls together with the carriage bolts I would get some Gorilla glue and clean the gap and apply as/per the instructions. I would use some Loctite on the nuts on the carriage bolts so they don’t come lose any more.
I would look for a reason this happened. You might have problems that this is just a symptom
Bill