We run 2 flex boards. Guys with the most time in bid the night flex and run linehaul overflows or when we run out of drivers on the line board. Daytime board guys with some strap will catch a run pretty regularly or a city route 8 months out of the year. Both boards work some crazy hours and are subject to starvation during slow times. I did it for several years and its a tough way to make a living. I feel for those men that do it because it's tough and not conducive to family life. As a side note our top 2-3 on each board have regular start times most days/nights. The flex board saves their azz around here because we are always short on drivers.