Toilet won't flush

Hey thanks for all the replies! I'll try to remember all the comments I need to make. The toilet sits on top of the tank. Yesterday when I flushed it I could see that the water level was close to the bottom of the valve, so I drained the tank. Also, you should know that the gray water flows into the black water pipe above the main slide valve. So I can tell that the main slide valve is still working by draining the gray tank, and it is passing fluid. I'm supposed to leave for a week long trip tonight which complicates things a little. My plan now is to clean out the toilet bowl with the plunger, which does a good job of sucking up fluid. I have the water shut off just in case it really can bleed into the black tank some how. I think I would have heard the toilet if the water were running in it and it never does when I'm looking at it. I'll keep messing with the snakes to see if I can make some progress but all they seem to be doing now is cleaning/loosening up old debris from the sides of the tank. I had to run and errand and was visiting with a friend who has had similar issues with his RV. Like he says my system could get any more simple, which is frustrating. I should be able to work this out.

For sure, I am not taking the hose of the pipe and running the snake up it. If the tank is full and it appears to be that would make a mess I never want to see, and I'm sure my park manager feels the same.

So I'll keep messing with my problem here until it's bed time just to see if I can get lucky. Thanks again for all the replies. Each one is good. Thank you.