To close this little nightmare out for anyone else who experiences it. Photos of the current scenario:
View attachment 169768
How it looked previously:
View attachment 169769
strap placed on pipe that failed and detached from blackwater tank(causing the spill ):
View attachment 169770
That strap is a Frankenstein combo of a plumbing strap and a muffler strap joined together. You can see where/how it’s attached in the first photo. It was the only place there was something under the plastic surface to attach solidly.
We plan to replace the shower in the future which is when we’ll revisit this issue to install blocking to be able add strapping like
@Rene T advised.
Advice to anyone purchasing a new Thor Class C, have your inspector verify there’s 6 brackets on the tank. Thor schematic specified 6, there were 4 on ours. One wiggled loose because it was not secured to anything, one was just hanging there and this failure caused the waste-line to detach from the tank. The additional strap added was to help stop the wasteline from detaching should this fail agin.
Thanks to everyone who tried to help us! We really appreciate the knowledge base here.