  It has recently shown that in supersymmetric left-right models with automatic
R-parity conservation, the theory below the $W_R$ scale is given by MSSM with
massive neutrinos and a pair of doubly charged superfields with masses in the
100 GeV range (with or without an extra pair of heavy Higgs doublets (M \geq 10
TeV) depending on the model). In this paper we study the unification prospects
for such theories and their phenomenological implications for collider
experiments. We study two versions of the theory, one with supersymmetry
breaking transmitted via the gauge and another where the same occurs via
gravitational forces. We point out that looking at multi $\tau$ final states
can considerably constrain the parameter space of the model.
