I highly recommend the Covercraft XN103 for solo bikes. I use two of them during 3 out of 4 seasons. The outer one catches the wear and tear (and UV damage) while the inner one does the final job of protecting the bike. During the winter I throw on my *very* old XN103 as a third outer layer.
The covers fit very well: not so tight you have to fight them, but not so loose that they get caught in the wind.
My experience so far (and several years with Urals) is that they are just as well protected outdoors year-round under this type of system as they would be in a garage or shed that was not climate-controlled.
Not sure what to use for the SC, but in the Ural world we used large ATV covers to cover the entire rig.
Matt