"Looking to ride mostly fire roads in our area due to the obvious problem on singletrack and that we would prefer to do on our singles."

As COLOTandem mentioned this is a typical yet funny line to read.Within this topic from MTBR are a couple of videos recently taken. These may give some idea of the limitations to a tandem on true technical singletrack.http://forums.mtbr.com/tandem-mounta...-824499.htmlPK