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You can do like @swiss did and put bows and a cover over the wrecker unit to keep it covered from the weather when not In use for a bit

Emergency brake engages driveline brake in the transfer case. It dumps air to the spring brakes which locks both rear axles. The kid that owned it had 2 of those spring brakes caged

Not standard. Just something you can do on any air brake systems. Most have that port for wrecker applications as well for towing reverse so there are still brakes. Or with the protote system

Its so they can activate the front brakes using the emergency side air while winching

Its from a variant other than a wrecker. Wrecker holds 100gal of Hydraulic fluid. 5gal would not help much in a leak

Fuel, water, fluid. Whatever they wanted to keep in it. That is the spare tire holder arm for 939 trucks.

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Moved this M936 for a gentleman this weekend. Started life as an A0 truck. Has 395s on HEMTT wheels now Truck physically has some abnormal stuff. No rebuild or mwo tags. It does have the Self recovery spring brake override. It has an air solenoid to engage the hi idle that is different...