Monroe Gas-Magnum 555 Series Load Assist Shocks
Monroe Gas-Magnum 555 RV shocks address ride-control needs across tow vehicles and Class A, B and C motorhomes. For selected Class C motorhome applications, the range also includes load-assist units that combine a shock with a spring. That application-specific distinction matters when choosing a replacement.
Understand the load-assist option
The spring-equipped load-assist units work along the same general lines as Monroe Load-Levelers, but they are specific to the listed RV application. They are not a universal add-on for every motorhome in the Gas-Magnum family. Start by identifying whether your chassis calls for a conventional RV shock or an approved load-assist configuration, rather than choosing solely from the series name.
Oil capacity, heat and damping
The Gas-Magnum RV design emphasizes greater oil capacity than OE shocks to help dissipate heat, along with a broader valving range intended to provide a smooth, comfortable ride. The range is described as offering up to twice the fluid capacity of standard shocks. The words up to are important: they should not be read as a fixed capacity increase for every part number or every original shock comparison.
Nitrogen charging and application selection
Nitrogen gas charging is used to reduce aeration and support ride and handling performance. For ordering, use the motorhome chassis, model year, axle position and relevant suspension details, not just the coach's exterior model name. The Monroe information links allow comparison with the separate RV Gas-Magnum and Load-Leveler discussions. A load-assist shock does not authorize loading beyond the vehicle's established ratings.
Product details

Related guides
Frequently asked questions
Are Gas-Magnum 555 load-assist shocks available for every RV?
No. Spring-equipped load-assist units are described for several Class C motorhome applications. The broader RV shock range includes other vehicle classes.
Does every shock have twice the fluid capacity?
No. The stated comparison is up to twice the fluid capacity of standard shocks, not a universal specification for every application.
Match Gas-Magnum RV Shocks to Your Chassis
Contact Shockwarehouse with your vehicle details and the parts you are considering.
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