Wow- That thing actually looks like a motorhome- you could sneak into the fancy RV parks !
Interior is in good shape, must be low miles?
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That looks like motor oil to me-... hmmm. So, no air brakes on this beast, correct? If not sure, ask the guy you bought it from.
Check your cooler lines. These usually have power steering coolers (radiator) of some type and maybe you have hydro assist brakes or something. Not real familiar w/ that chassis.
At least it limped home- gotta respect that. And that puddle in your driveway is your new welcome mat !