The trucking truth study guide is all I used before I took the exam for my permit and I didn't miss one answer on the air brakes or combination vehicles. I missed a couple on the general knowledge though because they were on the Missouri study guide. No big deal because you could miss up to 10 questions I think. The tanker I literally studied for about 30 minutes maybe prior and didn't miss a question. I used the study guide at prime for that though. All my other studying was trucking truth
A vehicle with two separate parts - the power unit (tractor) and the trailer. Tractor-trailers are considered combination vehicles.
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I just wanted to give feedback on the High Road course. I just took the practice tests from the school I am planning on going to and passed all of them. Your course is the best :)