They have brokerage. Just about all companies now-a-days have a brokerage department thanks to the capacity crunch.
I don't know anything about it at all, but worth checking out to see what loads are available if your in PA. http://experttransportationservices.com/www.experttransportationservices.com/Contact_Us.html
I would suggest subscribing to Internet Truckstop and working with whoever has freight. I don't think I would rely on any one brokers freight to keep you moving. The most important would be finding a customer or broker that has freight around your house.
I am not certain. Are you interested in running from IA to NJ, or running up and down the East Coast? Do you have your own trailer? Do you have a safe parking place?
OTR Doesn't bother me long as I can get a solid 34hrs @ home. Yes I have my own trailer and yes I parked in a secure gated parking lot!
C.H Robinson took advanage of a shippment on my insurance company last year. Filed a claim on a whole truck load of plywood that my insurance company paid for, when only 4 bundles were so call damaged. Guess what, the 4 bundles wasn't damaged at all and the frieght was resold at full price from a double brokered load. Never hauled anything for them!