We examine the production and decay modes of Z$^\prime$ boson at hadron colliders in an U(1)$^\prime$-extended MSSM. We choose a U(1)$^\prime$ model with a secluded sector, where the tension between the electroweak scale and developing a large enough mass for Z$^\prime$ is resolved by incorporating three additional SU(2) singlet fields into the model. We perform a detailed and systematic analysis of the production, followed by decays, including into supersymmetric particles, of a Z$^\prime$ boson with mass larger than 4 TeV, with particular emphasis on its possible discovery. We choose three different scenarios consistent with the latest available experimental data and relic density constraints. We concentrate on final signals involving $2\ell+{\not \!\! E_{T}}$, $4\ell+{\not \!\! E_{T}}$ and $6\ell+{\not \!\! E_{T}}$. Including possible SM backgrounds, we show the likelihood of observing a Z$^\prime$ boson is not promising for the HL-LHC at 14 TeV, but optimistic for 27 and 100 TeV.