  Upon assuming the $B-L$ Supersymmetric Standard Model (BLSSM) as theoretical
framework accommodating a multi-Higgs sector, we assess the scope of the High
Luminosity Large Hadron Collider (HL-LHC) in accessing charged Higgs bosons
($H^\pm$) produced in pairs from $Z'$ decays. We show that, by pursuing both
di-jet and tau-neutrino decays, several signals can be established for $H^\pm$
masses ranging from about $M_{W}$ to above $m_t$ and $Z'$ masses between 2.5
TeV and 3.5 TeV. The discovery can be attained, even in a background free
environment in some cases, owing to the fact that the very massive resonating
$Z'$ ejects the charged Higgs bosons at very high transverse momentum, a
kinematic region where any SM noise is hugely depleted.
