Welcome.
The best tip I can give anyone no mater what type of work you seek. Always interview the prospective employer, customer, partner/co-driver the same way if not tougher than they interview you. Ask the tough questions, in fact I try to make them justify my working for them, Its what I call psyche strategy just like playing chess and using the Jedi mind trick. If they dont answer your questions to your satisfaction politely turn down the job. A word of warning use common sense and caution when doing this so you dont risk not getting a decent job.
Now I will say if you dammage his equipment or freight, if you got piszed off and simply parked his truck somplace and he had to go get it, or pay somone to get it back, if you returned the truck and he had to repairit, have it cleaned, you simply didnt maintain it, or if you have had any advances paid so you can live on the road, any and all legit monies owed to him are his to claim and there is no foul. Most owners will keep your escrow or security deposit for anywhere from one month up to nine months of your last delivery to make sure there are no suprise expenses, fines, tickets, or freight claims. however should be returned after a stated time in your contract or employment agreement.
If your former employer has not given an acceptable explaination of why they held your money and you have proof that it is owed then you an always take it to the state labor board. All escrows especialy those held and your getting paid should have been explained.
Good luck
Bob Wolf.