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Are you saying that the tank won't drain, or the toilet drain is clogged?
That's a good start, RV shops would probably first try a tank flushing wand, followed by a toilet snake. After that, we would start to disassemble things.
So, the tank is full, and opening the waste valve won't allow it to drain because it's clogged down there, correct?
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A wand cannot be used in the black water tank on our year and model of 5th Wheel. I had called around for someone who could vacuum the tank on a Saturday. This was done before I received your answer and without disassembling anything. Thanks for your input.
You are welcome.
For future reference, another expert reminded me that Happy Camper makes something called "Extreme Cleaner" which is a very good tissue digester. It works in about 3 hours.
You may also want to add a valve by Valterra, and when combined with their HydraFlush lets you connect a hose directly to the tank to really get a good clean that can be viewed through plexi-glass. I had forgotten about these but have used them to good success.
About $50 for the whole set up. Happy Camper is in Medford, Oregon