Some companies may test you on this, but most do not. If you have your CDL they're mostly interested in getting you into a truck so that the wheels are turning. But don't ever think that pre-tripping your truck is not important - it is paramount to your safety and your success on the road. It is far better to find a potential problem and get it tended to before you get out into "who knows where" and have to have a tow truck, or costly road service, or even worse, a tire fire or an accident. Pre-trip is much more that just a step in the process to get your CDL.
Oh, I almost forgot - Congratulations! 
Wasn't it wonderful to be so over prepared when you went to the DMV.
A CDL is required to drive any of the following vehicles:
The state agency that handles everything related to your driver's licences, including testing, issuance, transfers, and revocation.
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TruckingTruth was founded by Brett Aquila (that's me!), a 15 year truck driving veteran, in January 2007. After 15 years on the road I wanted to help people understand the trucking industry and everything that came with the career and lifestyle of an over the road trucker. We'll help you make the right choices and prepare for a great start to your trucking career.
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I went to the dmv today to apply for my cdl. I took all the written tests (including hazmat , tanker and double/triples) and passed them all with flying colors! I definitely owe a huge thanks to truckingtruth, because the training program here helped me to be more than prepared, so thanks Brett! Now I have my permit!
I also just finished my first week of school. So far its been nothing but pre-trip, but next week I will start learning the"skills". I can't wait!
My question right now is: do companies test you on pre-trip? and if so, how thorough do you have to be? I'm wondering because I have watched a lot of pre-trip videos online, and those show a much more derailed pre-trip than how I'm learning it in school...
CDL:
Commercial Driver's License (CDL)
A CDL is required to drive any of the following vehicles:
HAZMAT:
Hazardous Materials
Explosive, flammable, poisonous or otherwise potentially dangerous cargo. Large amounts of especially hazardous cargo are required to be placarded under HAZMAT regulations
Dm:
Dispatcher, Fleet Manager, Driver Manager
The primary person a driver communicates with at his/her company. A dispatcher can play many roles, depending on the company's structure. Dispatchers may assign freight, file requests for home time, relay messages between the driver and management, inform customer service of any delays, change appointment times, and report information to the load planners.DMV:
Department of Motor Vehicles, Bureau of Motor Vehicles
The state agency that handles everything related to your driver's licences, including testing, issuance, transfers, and revocation.
HOS:
Hours Of Service
HOS refers to the logbook hours of service regulations.