Wow that is high mileage and camping as well a splendid effort , I applaud you.

I do short camping trips and am also over 60, however I have to have an inflatable mat couldn't get a good nights sleep on the foam rolls you are carrying in the pictures posted.

Can I ask the pictures of the new BB7 mountings were the bolts shown just to test/set it up ?

As for safety I would use either genuine brake mounting bolts or grade 8.8 high tensile bolts.

Wishing you many more happy miles ...