I have been fortunate enough to have few repairs. In forty years I spent 1500 SEK, about 200$US on repairs. Still I have some reflections.
Whenever I go on travel I try to have a backup. Most importantly, two hard disks for images, two battery chargers and two cameras. Normally I carry a full frame and an APS-C, width a normal zoom for each and a long zoom and an ultrawide I can use with both.
The latest trip I was concerned about the tripod which went into checked luggage. I would switch flights twice and I was concerned about delayed luggage. So I ordered a tripod from RRS to be delivered to a company I was to visit on the trip. I also bought a new 70-400/4.0-5.6 lens to use instead of the old 80-200/2.8 and 400/4.5 I used to carry, in order of saving weight but also because of some sharpness issues at the long end of the 80-200/2.8.
Unfortunately, I had some issues. The legs of the RRS tripod came pretty loose after just one day of shooting. The evening same day something came loose in the tripod mount of my 80-400. Fortunately I could fix both in the evening, with the tools coming with the tripod and my Leatherman tool. After coming home I realized that RRS applied Locktite improperly to the tripod, there was no Locktite in the screw threads. I bought a small bootle of Locktite and fixed the issue my self.
Anyway, I found out things can go wrong, even if you think you are prepared as well you can be.
I was lucky that I have not lost any images, just some frustration.