There are the hex nuts I call aircraft nuts . With the plastic insert in the top ?
https://www.google.com/search?q=airc...ntu&channel=fs
Do not know how much they cost .
In doing power for Telco , almost all of out terminations use crimp 2 hole lugs . When I asked why 2 hole , I was told it almost eliminates the loosening due to vibration . I shook my head up & down .
I realize you can not use 2 hole lugs , but evidently vibration is a recognized problem .
God bless
Wyr