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Expert Answers about Grand Design Momentum 5W Toy Hauler


  • Replacement Water Heater for 2019 Grand Design Momentum 351 M-Class
  • Yes, the Furrion RV Tankless Water Heater # FR68SR is able to replace the Suburban water heater on your 2019 Grand Design Momentum 351 M-Class. This will supply you with endless hot water. The only thing to consider would be the door size since you don't want gaps in the exterior from the old hot water heater. Since this comes with an 18" x 18" door that will not be a problem.
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  • Recommended Lift Kit for a 2022 Grand Design Momentum 350G
  • Hey Kenny, for your 2022 Grand Design Momentum 350G I recommend using the Correct Track Trailer Alignment and Lift Kit # RR23QX. This kit will raise your trailer by 1 1/4" to 2 1/4", works with 3" wide x 3-3/4" tall hangers or 3" wide x 5" tall hangers, and leaf springs up to 2" wide, and is made in the USA.
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  • Hydrastar Disc Brake Kit For a 2018 Grand Design Momentum Triple Axle Toy Hauler With 7,000LB Axles
  • I reached out to Hydrastar and they are very familiar with disc brakes on your 2018 Grand Design Momentum toy hauler. They said Grand Design typically gets their axles with 9/16" studs of which we only have the Hydrastar Disc Brake Kit w/ Actuator for Triple Axle Trailers # HYD54FR you found. These have the integral hub/rotor selection and we do not have any slip on options for the 9/16" studs. The studs which come on these hubs are going to be long enough for your factory wheels.
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  • 2018 Grand Design 395-M Leaf Springs
  • Hey Dennis, thanks for reaching out! All of our leaf springs are universal fits so the 7K Spring # e64SR you're seeing is simply the only 7K option we have. We also have the 6K # e94SR which is 26" long and sounds like a better match, but you are then going with a lower capacity so I recommend reaching out to your local trailer shop/RV dealer to see if they have a better solution for you.
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  • Replacement Landing Gear Motor for a 2015 Grand Design Reflection 5th Wheel
  • The correct replacement landing gear motor for your 2015 Grand Design Reflection 5th Wheel is the Lippert Components Tuson High Speed 5th Wheel RV Landing Gear Motor part # LC141893. The 12-Volt Motor Kit for Ram Landing Gear part # M1230 will fit but it does not have the correct RPM. This motor only has a 5,150 RPM whereas you need the above which has a 7,140 RPM.
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  • Three AC Unit Recommendation for a 2017 Grand Design Momentum 399th 5W Toy Hauler
  • Hey Jeff, thanks for reaching out! For your application I recommend picking up the Furrion Chill HE RV Air Conditioner System - Multi Zone - 15,000 Btu # FR24FJ along with the Furrion Chill HE RV Air Conditioner System - Single Zone - 15,000 Btu # FR55PV so you get as much help as you can in the hot desert. These come with the distribution box and wall mounted thermostat, but if you already have those then just let me know what your current setup is and I can find an AC system that might...
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  • Replacement Brake Assemblies for Dexter 7,000 lbs Axles
  • Thanks for the information but I was not able to get anything brakes related off of those part numbers from Lippert to compare to our inventory. To replace the brake assemblies on your Dexter 7,000 lbs axles we have two options that I have listed below: Dexter Electric Trailer Brakes - 12" - Left/Right Hand Assemblies - 7,000 lbs item # 23-180-181 Dexter Nev-R-Adjust Electric Trailer Brakes - 12" - Left/Right Hand Assemblies - 7K item # 23-464-465
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