If your sewer tank outlet is not just beyond a 90 degree turn, this type of fitting can inject water directly into the tank, and do a fair job of cleaning it out, right at the campground.
However I would not use MY white hose that is also used for drinking water. I carry a green hose that is not drinking water safe for such things as washing the RV or watering plants near it. I would use that green hose to connect to this type of fitting. You can get the short green or grey hose at a Home Depot or local hardware store.
I would post a picture, but Camping World website does not post the URL for it's pictures. It is a clear fitting that clips onto your sewer hose connection at the RV end, then the drain hose on the other outlet side. Connect and turn on your garden hose, and a few dozen gallons per minute will flow into the bottom of the black tank, and wash it out. Yet if your RV has several 90 degree turns between the black tank and sewer outlet, it might not work as well as the inventor intended it to work.
OK, So I found a whole page of tank cleaning supplies. A short wait for UPS to show up at your campsite (perhaps by July 8 or 9th?) and you can get any one of these. In the meantime, just putting your new "Green" garden hose down the toilet and flushing it out as best you can (with someone outside to shut off the water when it fills to the top) you should be able to break up everything inside the tank.
http://www.campingworld.com/category/sewer-flushing/1362 I guess this page shows how common it is to get the tank plugged with stuff, so you are not alone. . .
And I have read here that a trailer sales place will have one of their workers clean out the black tank for a fee. Probably a $200 or $300 fee, then they will pay one of their $10 a hour guys to clean it up. . . . You can do this, as moving it to a RV sales place would be expensive, in addition to the cost of having someone else do it.
Fred.
