I was looking for a way to identify my highest trained crew members and was going to ask if anyone knew an easy way to do this; instead, I googled and found a mod called Crew Skills database creator
It was easy to install and as soon as I launched the game it created a CSV file that listed all my crew members and shows all the info I was looking for – what tank they are trained for, what tank they are currently in, and details on each crew skill/perk.
I found out that my single best crew member is one of those female commanders we got over the holidays (not sure which year) named "Julia Winnfield".
I currently have her training in my LT 432 where she has to be a commander, radio operator, and loader, and even with 6 skills (92% of the 6th one), there are still 10 more available skills/perks available.
She's going in the B-C 25 t when I get another 4 mil credits.
I've got 21 crew members that have reached the 6th skills and 97 crew members that have 5 skills/perks.
If you are interested in this mod, it was easy to install but didn't have instructions.
The CSV file was generated and populated in C:GamesWorld_of_Tankscrew_members.csv
Not sure if it's completely up-to-date with all the newer tanks but it seems to work.
One handy side-benefit, I found some 'hidden' crew members squirreled away in some 'reserve' rental tanks that I'd forgotten about.