Why is the parking guidance in Section 7.1.7 especially important for doubles and triples drivers compared to single-trailer drivers?

49 CFR 383.115(c) ("Handling and stability characteristics including off-tracking ...") and (e) ("Operating practices and procedures not otherwise specified"); AAMVA CDL Manual Section 7.1.4 "Look Far Ahead" and Section 7.1.7 "Parking the Vehicle," p. 7-1

Every added trailer multiplies the complexity of backing because each articulation point off-tracks independently, and jackknife risk is a running theme throughout Section 7. Understanding why this guidance exists, not just memorizing it, helps drivers make the right judgment call in real-world lots that don't look exactly like a test question.