Curt L05 Rota-Flex Shd Pin Box - 21,000 Lbs

CurtSKU: 328329

Sale price$1,097.25 Regular price$1,741.67
FREE Delivery Estimate January 11 – January 16
⚠️ Delivery times extended due to RV industry holiday shutdown.
Smooth Sailing Starts Here with the Rota-Flex 5th Wheel Pin Box
Upgrade your towing experience with the Curt L05 Rota-Flex Shd Pin Box, featuring a pivoting head and robust rubber compound to reduce chucking and absorb road shock for a noticeably smoother ride. Built from high-strength steel with a rust-resistant black powder coat, it’s ready to install and directly replaces Lippert 1621 5th wheel pin boxes—all with a heavy-duty 21,000 lb towing capacity.
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  • IMPROVES RIDE – The Rota-Flex boasts a pivoting head that moves and controls back and forth movement of the king pin within the hitch which significantly reduces chucking and provides a smoother ride
  • SHOCK ABSORPTION TECHNOLOGY – To minimize strain and reduce wear and tear on the trailer, the Rota-Flex contains a robust rubber compound in its head that absorbs the road shock, bumps, and vibrations experienced on rugged terrain
  • SIMPLE INSTALLATION – The Rota-Flex is ready to be installed as soon as it comes out of the box. It uses the same bolts as the original pin box, so no additional hardware is needed for installation
  • BUILT TO LAST – Constructed with steel and a black powder coat finish that protects against rust, the Rota-Flex is extremely long-lasting to ensure peaceful towing day after day
  • SPECIALLY DESIGNED – The Rota-Flex is specifically configured to replace Lippert 1621 5th wheel pin boxes with a towing capacity of 21,000 lbs.

Take Control of your ride with the CURT® Rota-Flex™ 5th wheel pin box! The Rota-Flex boasts a pivoting head that moves and controls back and forth movement of the king pin within the hitch which significantly reduces chucking. It also contains a robust rubber compound in its head that absorbs road shock, resulting in less strain and reduced wear and tear on your trailer as you travel. All roads lead to some kind of destination, and this road leads straight to a smoother ride. Upgrade today and leave rough rides behind!

Towing 21,000 lbs. never felt so good! The Rota-Flex is designed to replace Lippert 1621 pin boxes and has a 21,000 lb. gross trailer weight (GTW). It comes ready to install and uses the same bolts as the original pin box, so it doesn’t require any additional hardware for installation. Constructed with high-strength steel and finished with a black powder coating, the Rota-Flex is the ultimate 5th wheel pin box to tackle your towing needs for the road ahead.

  • Replaces Lippert 1621 5th wheel pin boxes
  • Reduces chucking and absorbs road shock
  • Long jaw with pivoting head
  • Bolt-on installation with no assembly required
  • Constructed with steel and a black powder coat finish that protects against rust
  • Powder-coated lower jaw
  • 21,000-lb. towing capacity
  • Made in the USA
100% Authentic OEM Parts

Factory-Fresh OEM Parts — the same brands installed in new RVs straight from Elkhart. Genuine, name-brand components made to order — never generic, never outdated. Sourced directly from the original RV manufacturers for perfect fit and factory-level quality.

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