What height requirement applies to tanks mounted behind the rear axle of a motorhome?

The correct answer addresses safety and regulatory standards concerning the mounting of LP gas tanks in motorhomes. Specifically, when a tank is mounted behind the rear axle, it is crucial that the bottom of the tank is positioned above the height of the rear axle or the lowest point of the frame. This requirement is in place to prevent potential damage to the tank during normal operation and driving, such as when navigating over bumps or rough terrain, where a low-mounted tank might make contact with the ground or obstacles, leading to leaks or dangerous situations.

Maintaining the tank above these critical heights ensures that it is protected from road debris and minimizes the risk of accidents that can arise from compromised tank integrity. Additionally, following this regulation is essential not just for safety but also for compliance with state and local codes governing the installation of gas systems within motorhomes and similar vehicles.

Other options lack this necessary specification for safe operational height. For example, stating that the tank can be mounted at any height overlooks the safety implications involved. Similarly, requirements about securing tanks to the roof would be impractical and not aligned with typical design and engineering practices for motorhomes.