I have a couple problems at least that are stacking up on me, and I'm looking for some guidance as I attempt to crawl out. I apologize in advance, as this will likely be a wall of text, but I'm just trying to get all this down not just so I remember what has happened, but to make sure I'm not doing anything too dumb.
A couple weeks ago, I posted that my HWH wouldn't go into travel mode. I got some great feedback and planned to replace a fuse and see where that got me, but we were on our way out of town for a couple of weeks. I assumed I could pick up where I left off when I returned.
Instead, when we got back I went to the replace the fuse and found that my shore power circuit at the storage seemed to be tripped because there was no read-out on the display of my surge protector. And the chassis batteries were discharged. And the engine batteries were discharged.
Oddly, the extension cord I had hooked up to my cord reel was still live - but I couldn't get the surge protector to come on. I looked for a reset or signs of a failure, couldn't find anything. I removed the surge protector and hooked up the shore power line. After a couple minutes, the system seemed to try to start up. Some lights in my inverter bay came on, various clicks, and the air compressor tried to fire up - but then the circuit tripped as there must have been a large amp draw from somewhere. I tried this a couple of times with the same result.
(Incidentally, I plugged the surge protector back in after an hour(?) and it works again)
So I assumed that maybe my best bet was to try to jump the coach. The first thing I tried was a jump pack - I got the biggest one O'Reilly had on the shelf, a Super Start 1200 peak amp power pack. Tried to start - wouldn't turn that engine. We aren't just low, we're dead.
So I put on a battery charger that I've had for years. Gave it a couple of hours, but it stopped charging at some point since it's not designed to charge loads this large. So... I picked up a bigger charger that claimed it was RV compatible (whatever that means). I put it on to charge this morning, and when I went to attempt to start the coach this evening, it still wouldn't turn over. However, the air compressor had come alive and was running. And that leads to the next problem.
The compressor was running, but didn't seem to be generating any pressure, and there was air leaking from this connector (attached image). Here's a video if it helps. Shared album - Steve Jones - Google Photos How many failures deep am I now? Sheesh...
So my current plan is to allow the coach to charge over night. I disconnected power from the air compressor - it was running non-stop, not creating pressure, and I don't see any value in potentially burning up a motor and slowing down the charging process.
I don't know how old any of my batteries are, so I think I need to be prepared to replace them. But to do that, I'll need to get it started, raise it up, and block it off so I can pull batteries. But of course, that means I need to get it started and figure out my air issue. 
So my questions:
1. Am I doing anything really dumb yet?
2. Is getting it started the right first step?
2a. If so, is charging it then using the jump pack (if needed) a good approach?
3. What's up with the air leak?
4. Any speculation as to why my surge protector might have tripped leading to my batteries draining?
I'm still a new owner and I'm prepared to work on things and get my hands dirty figuring out systems and problems, but this series of issues isn't quite what I expected this early.
Thanks in advance to anyone who has some insight.
-Steve
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Topic: Starting a dead coach