Custom Critical is run by expediters. They are independent OTR contractors. Typically team operations that pick stuff up and drive close to non-stop till it is at the destination.
It used to be fairly profitable for O/O's but is getting less so.
The biggest problem for expediters is delivering into an area that has no outgoing freight (think North Dakota). Now the contractor is in the middle of no where with little or no prospect of a load. Time to deadhead. Guess who pays for that. And, if I understand it, forced dispatch.
You can find out lots by going to expeditersonline.com (something like that.)
Lots of hatin from their contractors there too.