Off the top of my head, I watch a few equipment channels like Dirt Perfect, Letsdig18, Diesel Creek, Vbelt and Son, a few wheeling channels like BleepinJeep, Flex Rocks and Rollovers, Dirt Lifestyle, Misfitz Offroad, Mischief Maker, BSF recovery, and some gear head channels like Fab Rats, Matts Off Road Recovery, Greg Alberalla, Muscle Rod Shop, and most of the Street Outlaws channels. Some of those listed have second channels that I sub to also, I think I'm sub'd to like 60+ channels.
Here is a thread from a few years ago about this topic, might be cool to see if some people's list has changed.
YouTube Channels
Duane