[JRTJH]

May, Not to be "pointing fingers at someone I have never met" but are you sure the "honey wagon guys" are actually closing the black tank valve? Or is it possible that they just leave it open until they pump the big tank????

If they have been doing that, it would easily explain why you have a poop pyramid. If they have been closing the valve (and doing that part properly) then it would seem that someone "inside the trailer" is simply putting too much TP down the chute....

At this point, you don't want to add more TP to the problem, at least not until you get the pyramid resolved and broken up. So, I'd suggest a trash can beside the toilet with a self closing lid and a plastic bag as a liner. Just do your business, then put all the TP in the trash can. That will prevent the additional paper from compounding the problem and will also allow you to keep the black tank at least half full of water to help soak and soften the hardened pile.

As said, use something rigid to help break up the pile (from the top) but don't get too aggressive as you don't want to poke holes in the tank itself...

It may take a week or more of soaking and breaking up the pieces before things flow again. In the mean time, don't add to the problem if you can avoid it.