How Many Bolts are Required to Install the Trailair FlexAir Pin Box on a Trailer
Updated 03/23/2016 | Published 03/22/2016 >
Question:
I ordered and received the LC328492 for the Redwood,from your company, which I was told was the correct hitch for the pin box # 1621. I installed the king pin hitch to the trailer and took measurements before mounting , when mounting aliening holes to match units, I noticed the lowest hole on both sides to the front were either not drilled properly or a flaw in workmanship cause they are blocked with the reinforcement plate from the inside of hitch. So, with this issue I can not raise the hitch to meet the height that need to meet the level of unit with my truck,a 2012 Ram 3500,Longhorn when hooked and in transit. Now , I believe I have enough space to raise the hitch one hole, but I would have to illuminate two bolts on each side to do this, which the original roto/flex hitch only had 4 bolts on each side at the time of installation.
asked by: Rick S
Expert Reply:
When installed the Trailair Flex Air 5th Wheel Pin Box # LC328492 only requires 4 bolts to be ran through the pin box and the trailer frame. I attached a picture that shows this pin box installed on a similar trailer and that it only uses 4 bolts. So if you can secure the pin box at the height you need with 4 bolts you would be just fine.
Product Page this Question was Asked From
Curt Flex Air 5th Wheel Pin Box - Lippert 1621 - 18,000 lbs
- 5th Wheel Pin Box
- Upgraded Pin Box
- Absorbs Road Shock and Reduces Chucking
- 18000 lbs
- Air Ride Suspension
- Fixed Turret
- Lippert 1621
- CURT
more information >
Continue Researching
- Search Results: pd4590licsv
- Video: Review of Progressive Dynamics - RV Converters - PD4590CSV
- Shop: Progressive Dynamics REL 90A 4500 Series Inteli-Power Converter Section
- Video: Review of Firestone Air Bag Compressor Kit - Replacement Elbow Connector - F3031-1
- Video: Review of Gen-Y Hitch Fifth Wheel King Pin - Installation Hardware Kit - GY86FR
- Video: The Low-Down on the Replacement 1/4" Elbow for Air Lift Ride Control Air Helper Springs
- Video: An In-Depth Look at the Wheel Masters Spare Tire Inflation Kit
- Video: Lippert or UltraFab TrailAir Pin Box Tank Valve Review
- Video: Set up: Adjustable Width Trailer Hitch Receiver for RVs, 22" to 66" Wide on a 2009 Chevrolet Kodiak
- Shop: Firestone Inflation Valve for 1/4" Tubing
- Shop: Replacement Schrader Valve Fitting for Firestone Coil-Rite Air Helper Springs - 90-Degree
- Shop: Replacement Pin Box Tank Valve for Lippert or UltraFab TrailAir Pin Boxes
- Shop: Replacement 1/4" Elbow for Air Lift Ride Control Air Helper Springs - Qty 1
- Shop: MORryde Rubber Equalizers for Tandem Axle Trailers - 33" Wheelbase - 8K
- Shop: Replacement Elbow Fitting for Air Lift Ride Control Air Helper Springs - 90-Degree - Qty 1
- Q&A: Determining Torque Specs for Installing Trailair Pin Box
- Q&A: Do You Have to Replace the Converter Section of a PD4590 Power Center For Lithium Batteries
- Q&A: Determining The Pin Box Bolt Pattern Of A 2019 Keystone Montana 3791 RD With The Pin Box Tag
- Q&A: Cushioned Pin Box Recommendation for 2025 Grand Design Solitude 27D
- Article: 4 Steps to Choosing Your 5th Wheel Pin Box
- Q&A: Replacement Sidewinder for Trailair Flex Air
- Q&A: MORryde Cushioned Pin Box Upgrade for a 2012 Keystone Cougar 5th Wheel
- Q&A: Correct MORryde X-Factor Crossmember for 2022 Keystone Cougar 316RLS
- Article: 30-Amp and 50-Amp RV Service: What's the Difference?
- Article: Converting Your RV Water Heater to Tankless
- Article: Fifth Wheel Trailer Hitch Information and Installation Tips
- Article: What are the Common Types of Propane Fittings Used on RVs?
- Article: Choosing the Right Suspension Kit for Your Truck and Trailer
- Article: How to Mount a Truck Bed Camper


