Working on a 5 ton equipment trailer with hydraulic surge brakes:
0:00 Replacing trailer lounge master brake cylinder assembly
4:01 1 year + remove axles, brakes, suspension
13:35 install new axles, suspension, brakes
32:35 Demonstrate problem with trailer not going in reverse
37:16 install block off valve to fix reverse problem
There some grey dodge footage in here, and some excavation footage.

Headlamp: https://amzn.to/32xEREd