According to the AAMVA CDL Manual's guidance on parking doubles and triples (Section 7.1.7), what should a driver check before pulling into a parking spot?

49 CFR 383.115(e) ("Operating practices and procedures not otherwise specified"); AAMVA CDL Manual Section 7.1.7, "Parking the Vehicle," p. 7-1

Backing a doubles or triples combination is one of the hardest maneuvers in trucking because of off-tracking and jackknife risk across multiple articulation points. Picking a parking spot you can pull straight through avoids ever having to attempt that backing maneuver in a tight lot. This simple habit prevents real collisions with parked vehicles, structures, or pedestrians.