i liked my bob for long tours (3 months-1 year), across the us or around oz.
i'm gonna be on the bike for a long time, and i don't wanna just bike.
i want my short wave radio, and my hiking boots, and my extra large tent, and........
i also want to easily carry 5 gallons of water when crossing a stretch of desert.
single-wheel handles fine up/down paved hills.
not too bad on rough roads if going slowly, not as fun on downhill dirt.
big drawback is having the extra thing to carry. load onto trains, or up three
flights of stairs, or over fences...