I make sure the Hydro test is done on all my tanks every 5 years. I don’t visually inspect my tanks - ever.
BTW - a visual is not a DOT or any other agency requirement, it is done at the discretion of the dive shop. First it is a money maker but secondly for an LDS it is a small insurance that someone is looking at the tanks to ensure they are not being abused and could possibly hurt their fill equipment or employees through a ruptured tank. But think about this - firemen use SCBA all the time and NEVER do a visual inspection - they do Hyrdo’s...
I am lucky - I fill my own tanks and on vacation I bring my tanks or rent...