[DK on the road]

                Update;
I was at Newell and asked them to help me resolve this plugged sewer line issue. By the way, there crew was super cool to work with. I asked if I could help and they encouraged it. I removed the toilet and we tried to power snake the line. There are multiple elbows on the line. At least  4 before the bedroom, and 3 or 4 after the bedroom

After no success at snakeing the line from the bathroom, we cut out 2 lines that lead into the tank in the lower compartment, to get to the one that services the toilet. We attempted to snake from the bottom up and could not get past the 3rd elbow.  It quickly turned into the nuclear option. We removed the bed, the flooring and foam around the pipes. We gently cut the  sewer pipe without cutting the water, or Aqua hot lines. The problem was also that the toilet line was below other lines.  

Once the pipe was cut and removed, we found a build up of some solid product reducing the line to less than 1".  It was an  1 1/2" ABS pipe, but with about 5/8" of build up the flow was restricted. We were able to push the snake up and down the line from this central "clean out point" in the bedroom. A blockage of paper down stream from the bedroom, had turned into a paper machete plug about 6" long. We were able to remove some, but it was nearly like concrete, we could not get the screw end of the snake into it. We removed more floor and pipe to get the plug out.  

After all that could be seen and found, we snaked further down stream and found more of a problem. UGH...We finally cleared the line and the Newell crew reassembled the pipe, foam, subfloor, flooring, back to its original appearance. 

After all of that. I have become and expert of how the lines run.  

Lessons learned, 
1) Always make sure your front of coach is lower than the rear. Somebody must have allowed it to sit and wrong and...
2) something has allowed the water to turn into a Calcium or solid in the flow line that was not paper (the black material in the pictures).

I don't know what caused this last problem. Hard water supplied ? Medicines mixing with urine, mixing with hard water, surrounded by Aqua hot lines that allows it to dry up quickly if all the planet aligns. 

Either way, this line has no clean outs and is not able to snake. Take care to keep it flowing freely. I don't know what the correct pipe cleaning solution is, but I will start with something.