  Right-handed sneutrinos are natural components of left-right symmetric
supersymmetric models where the gauge sector is extended to include
right-handed weak interactions. Unlike in other models where right-handed
sneutrinos are gauge singlets, here the right sneutrino is part of a doublet
and could be a dark matter candidate whose annihilation proceeds via gauge
interactions. We investigate this possibility, and find that relic density,
low-energy observable and direct supersymmetry search constraints can be
satisfied when the lightest supersymmetric particle is a right-handed
sneutrino. We introduce benchmarks for left-right supersymmetric realizations
where either a sneutrino or a neutralino is the lightest superpartner. We then
study the LHC signals arising through resonant right-handed slepton production
via a $W_R$ gauge-boson exchange that lead to final states enriched in leptons,
additionally containing a large amount of missing transverse momentum, and
featuring a low jet multiplicity. We find that such a resonant production would
boost the chances of discovering these weakly interacting supersymmetric
particles for a mass range extending beyond 1 TeV already with a luminosity of
100 fb$^{-1}$. Finally, we compare sneutrino versus neutralino scenarios, and
comment on differences with other sneutrino dark matter models.
