FMCSA
Top Cargo Tank Facility Violations
What gets written up most often at registered cargo tank facilities.
FMCSA's list of the violations most frequently cited at cargo tank facilities.
Read it as a checklist in reverse. These are the things being missed often enough across the industry to show up in aggregate — which makes them the cheapest place to look first when you're hunting for your own gaps.
There's a companion list for manufacturers on the same site if you build as well as repair.