Final answer:
The most likely to get stuck on raised railroad crossings is a low slung car carrier due to its low clearance. A trailer bouncing up and down slowly on the highway suggests it's nearly empty because heavy loads reduce bounce.
Step-by-step explanation:
The vehicle most likely to get stuck on raised railroad crossings is C. a low slung car carrier. This is because the undercarriage of a low slung car carrier is closer to the ground compared to a single-axle tractor, regular trailer, or an empty moving van, making it more prone to becoming lodged on the raised sections of a crossing. The key factors at play include the clearance between the vehicle's underside and the road surface, and the vehicle's approach and departure angles.
The trailer is more likely to be heavily loaded when it is bouncing up and down slowly.
The trailer of a freight truck bouncing up and down slowly indicates that the trailer is heavily loaded rather than nearly empty. This is because when a trailer is heavily loaded, more weight is distributed to the suspension system, causing it to compress and rebound more slowly. On the other hand, when a trailer is nearly empty, there is less weight on the suspension system, resulting in quicker and more frequent bouncing.Regarding the observation of a trailer bouncing up and down slowly on the highway, it suggests that the trailer is more likely nearly empty. A heavily loaded trailer would have less bounce as the weight would dampen the movement, causing it to be more stable and less susceptible to the up-and-down motion.