Some thoughts on the San Francisco 49ers' preseason schedule:The schedule: Week 1 Aug. 7 at Ravens; Week 2 (Aug. 14-18) vs. Denver; Week 3 (Aug. 24) vs. Chargers; Week 4 (Aug. 28) at Houston.Harbaugh Bowl: Jim Harbaugh and John Harbaugh will meet on the field for the first time since the Ravens edged the 49ers in the Super Bowl in February, 2013. The idea of the 49ers going out to Maryland for some practices before the game makes sense. It's a long way to go just for one preseason game.