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The big connections on each end are coolant... could be the trans connections in the middle, loose or with a bad seal. Once the trans fluid warms up it is able to squirt a little out. I notice a little all the way up on the housing under the crankshaft. Unless you have a lot of airflow...

it won’t cause the hydraulic system to pressurize. There is a safety valve built into the brake system that disconnects the air used for the air operated hydraulic pump when you apply park air/release the park brakes. as mentioned you want the lower right button in and locked for cab...

Yea, thats the trans cooler. Could be it, could also be oil from the oil pan or timing case cover above it... you said it was clear though, which would probably indicate trans oil as the engine oil goes dark/black very quickly in service.

Nice looking truck! You can use AW-32 in the cab hydraulics as well. If the truck has military oils in it, then it most likely has the same 15W40 in the trans as is in the engine...

The steering and hydraulic system(did you get a winch truck?) will use AW-32. you could run 46 in it at higher temps if you really planned to work it hard. The winch system would be intermittent use and unless you are really wheeling and working the steering system hard, so would the steering...