Don't do it,, been there done that,,the only way to make any money doing that is you have to get your own authority and find your own customers,...
when i first started with them they only took exeperencd drivers the loads where much longer and you could select from 3 loads and often more...
i am a o/o and my latest trk a 2011 cascadia i got a tri pack thinking it would be a money saver,wrong,thing is a peice of junk, thing breaks down...
they are a miserable outfit to work for, give you mininum miles you must run per mounth 10,600 but the higher you go up the pay scale the shorter...