On my fifth wheel, the pipe makes a 45 just as it leaves the toilet -- a broom stick isn't going to work. If the wand is flexible, it would. Probably as easy as anything would be to just stick a hose down in there and keep moving it around. I'm not sure if Rid-X would be effective or not. Usually, this is just a complete waste of money in a normal septic system, since the human body produces plenty of bugs which will work to dissolve the waste.
I would be cautions about the use of one of the rubber bladder mechanisms, since they produce quite a bit of pressure. My dad has made a small fortune with those but be careful. Repairing the drain pipes on a RV is much more of a PITA than a regular house. Would I try one -- probably, but be forewarned.
Water and patience would likely be the best solution.
