Thomas,
From a 13 veteran CDL examiner (Doctor of Chiropractic),
BP gives you guys the most stress at least until I say we have to check for hernia (and it is a must do item on the exam form). Also, vision is a issue sometimes. Alot of drivers come in tired and semi-dehydrated which affects vision. Best to not stress. Most of us are not trying to nit-pick on the exam.