Mixing and matching local-ish trucking vs OTR is like mix and matching "shootings that happen at schools" with "shootings that target a school". You lose resolution on both issues and it's counterproductive if your goal is to understand either.

The commercial (i.e. CDL requiring 26k+) fleet is fairly bimodal, two fleets if you will. You've got local and local-ish small carriers operating bottom dollar box trucks and tri-axle mack dumps from the 80s. Your average OTR truck is full of cameras and nannies and owned by a mega fleet. The owner operators in their long nose petes exist but are rare. Yeah I'm generalizing here and there's a continuum between all these but still.