Unknown leak?

Could be the axle shaft seal. How's the drums look inside?

 

It could be but around 19 seconds & before it shows both drum backing plates & they appear to be dry so my eyes say doubtful..

 

How about an update, take a peek at that shock seal or other suggestions?

 

Weirdness....
Theyre listening, just got this in my tik Tok feed....
Guess these tacoma rear diffs have an issue with the vent getting plugged from offroad dirt, mud, debris, etc...
Pressures build & blowout that larger round pumpkin seal...
Guess theres some kit that relocates & raises the vent, makes it similar to most ford trucks....
"jasonexplainsthings"

Still say look at that shock though....