Raptor Black waste tank not draining

OK, here's what happened.. I tried running snakes in both ends of the black tank and wasn't able to find the exit hole either way, there were just too many options the snake could take and it never would find the right one. I then ended up pulling the valve/gate out, still nothing came out, I then took the snake and snuck it in the opening and as soon as I started running it through it started pouring out, I did get out of the way without getting soaked. I probably flushed the tank out at least 20 times, reinstalled the valve and got her working like new again, I then flushed it out several times again just to make sure I got everything, I'm not sure I did or not but at this point I figure I can drive it around and let it slosh around and every time I dump more and more will start coming out. I am very happy about getting this fixed without spending a ton of $$$... Oh, and by the way I did end up finding dryer bounty towels in the tank that ran out during this whole process, I can't believe someone would put those down the toilet.. Thanks for all your help guys...