Almost all solo this year as I can't keep pace with the normal cycling circles (injury). Self supporting your long rides is a core competency and is actually pretty rewarding. Carrying a credit card, a $20 bill, and a phone go a long way for the "worst case scenario" (barring horrendous accident of course). I've yet to see a place without at least one motorist who will stop for a cyclist in distress on the roadside waving a $20 in the air....