  Searches for new leptophobic resonances at high energy colliders usually
target their decay modes into pairs of light quarks, top quarks, or standard
model bosons. Additional decay modes may also be present, producing signatures
to which current searches are not sensitive. We investigate the performance of
generic searches that look for resonances decaying into two large-radius jets.
As benchmark for our analysis we use a supersymmetric $\text{U}(1)'$ extension
of the Standard Model, the so-called U$\mu\nu$SSM, where all the SM decay modes
of the $Z'$ boson take place, plus additional (cascade) decays into new
scalars. The generic searches use a generic multi-pronged jet tagger and take
advantage of the presence of $b$ quarks in the large-radius jets, and are
sensitive to all these $Z'$ decay modes (except into light quarks) at once. For
couplings that are well below current experimental constraints, these generic
searches are sensitive at the $3\sigma-4\sigma$ level with Run 2 LHC data.
