If the black tank sparger bar option isn't on the RV there is a wand that one can stick down into the toilet to spray the walls and break up the "junk" to wash it down the exit hose.Gotta be single ply TP if you want the stuff to quickly breakdown and not clog up the sensors.
Speaking of sensors - if you don’t have a black tank spray option built into the RV, dump a bunch of the ice down the toilet before heading down the road. It will rattle around and clean the sensors until you get to a dump site.