Before I post this summary, I'd like to thank everyone who's been involved for their efforts in trying to help me. I have learned a great amount and I truly appreciate your kindness and help.
Final update:
tl;dr: Despite the awesome support and helpful attitude of this forum, I was not able to fix the issue myself. What could have been a relatively quick fix, due to stubbornness, became an elongated battle.
713:4.
When this happened, my initial thought was to let a tow truck bring us to the nearest workshop. That gut feeling... don't ignore it =)
Instead I managed to push it the remaining stretch to our destination, where it ended up stranded for a month.
Embarrassing, yes. But I feel I need to share it to avoid make sure I don't make the same mistake again. =)
After running his diagnostics and a few tests on site, he suspected had something to do with the injectors. As a result, he suggested I take the vehicle to a diesel mechanic located about 25km's away.
Having left my stubbornness behind, I took his advice and arranged the transportation of the motorhome to said workshop.
The motorhome was parked outside the mechanic's ground for two days, waiting for a slot.
The culprits were clogged injectors. Dirt had accumulated on the tips preventing the mist to form. No mist means no ignition.
He ran them through their cleansing machines, plugged them right back, and lo and behold, it's alive!
4 hours. From work started to the phone call telling me that it's working again.
4 hours.
Compared to the 713 hours it's been standing, simply because I was convinced I could break that wall with my forehead.
Removing the engine cover, I noticed that the injectors were rusty. When asked about it, the mechanic explained that it's not normal but happens, maybe due to fuel (?), or perhaps it is a case of water leaking onto the engine block.
To be honest, I would have expected a degradation of performance or some smoke development due to unburned fuel in some cylinders. Not a complete engine stall with the subsequent refusal of restart.
I'll be running better fuel and the occasional fuel injector cleaner through the system from now on.
rolled onto exhaust tail pipe too see if inflation occurs?
like .... 
