Are you using RV Paper? Also a treatment in your tank will help break the solids down. Those dreaded wipes are also a no no, as are que tips, they do not dissolve. There is no easy answer to breaking up a clog once formed. You may be able to add water and drive your RV, it may help to agitate the tank and break the blockage. If you have a black tank flush, be sure to always use that after each dump, they do work.
2011 Toyota Tundra double cab