  Making an inventory of the Solar System is one of the four pillars that the
requirements for the Large Synoptic Survey Telescope (LSST) are built upon. The
choice between same-filter nightly pairs or different-filter nightly pairs in
the Wide-Fast-Deep (WFD) Survey will have a dramatic effect on the ability of
the Moving Object Pipeline System (MOPS) to detect certain classes of Solar
System objects; many of the possible filter pairings would result in
significant ($\sim50\%$ or more) loss of Solar System object detections. In
particular, outer Solar System populations can be significantly redder than
those in the inner Solar System, and nightly pairs in $r$-band will result in
the deepest survey for the outer Solar System. To maximize the potential for
outer Solar System science, we thus advocate for ensuring that the WFD survey
contains a sufficient number of $r$-$r$ nightly pairs for each field during a
discovery season to ensure detection and linking using MOPS. We also advocate
for adding additional spectral energy distributions (SEDs) that more accurately
model outer Solar System populations to the pipeline for evaluating the outputs
of the LSST operations simulator. This will enable a better estimate of how
many Solar System population detections are lost or gained for different filter
choices in the WFD survey.
