Lippert Trailair Air Ride & Flex Air 5th Wheel Pin Box | 16K–21K

Trailair invented the air-ride pin box, and it is still the cure for chucking. An integrated air bag buffers road shock between truck and coach while a gas or oil shock controls the rebound. The Flex Air adds a rubberized compound and the Rota-Flex® pivoting head in its lower jaw to stop the vertical tug-of-war as well. Rust-inhibitive powder coat; limited 1-year warranty. Choose by your pin box rating and mounting pattern.

Options

• 2020131232 — 16,000 lb air-ride pin box (150 lb)
• 1191151 — 18,000 lb pin box, powder-coated (108 lb)
• 328492 — 18,000 lb Flex Air — air bag, oil shock, Rota-Flex pivoting head (232 lb)
• 155943 / 158778 / 807710 — 21,000 lb Trailair Air Ride — scissor-action air bag and gas shock (155–181 lb)
• 369535 / 807711 — 21,000 lb Flex Air — air bag, rubberized compound, oil shock, Rota-Flex head (181–239 lb)

🚚 Freight item: ships by LTL freight due to weight.

⚠️ Match the Part Number: mounting bolt pattern, wing width and drop vary by model and are not published at the source — match the number on your existing pin box or send us a photo of the mounting plate. Several part numbers share a rating; the difference is the mount pattern.

Key Features

• Integrated air bag absorbs road shock and vibration
• Gas/oil shock absorber handles rebound and controls chucking
• Flex Air: Rota-Flex® pivoting head controls vertical tug-of-war
• Rust-inhibitive powder-coated finish
• Limited 1-year warranty

Specifications

• Brand: Lippert
• Ratings: 16,000 / 18,000 / 21,000 lb
• Series: Trailair Air Ride; Flex Air