If you are a trucker, chances are you prefer driving to doing paperwork. Many professional drivers detest the seemingly-endless paperwork that is a part of trucking.
However, all of that paperwork is needed for some reason or another. Your company does not create paperwork for no reason. Signed bills of lading, for example, are often needed for a carrier to be paid promptly by a customer. Not handing in your paperwork could result in financial penalties to your company.
The other reason why it is important to be good with your paperwork is professionalism. Your company likely has paperwork problems with many drivers, and being quick and thorough with your paperwork is a good way to show that you are a professional operator.