![]() The Flex Air weighs in at a robust 225 lbs. The biggest challenge in swapping out the old pin box with the new Flex Air is the weight involved. The new pin box will be installed as close as possible to the same height so proper truck bed rail clearance and trailer level are maintained. Prior to removing the pin box, I took a measurement from the bottom of the king pin to the ground. Four nuts and bolts on each side hold the pin box in place. I needed a 15/16 th socket, torque wrench, and a large 15/16 th wrench. Removing the old OEM pin box was dead simple with the right tools. ![]() With a built-in adjustable airbag, oil filled shock, pivoting head and thick rubber buffer it looks like just the ticket to smoothing out our journeys. Therefore, I was super excited when Lippert Components contacted me offering to send out a new Flex Air Pin Box for a good old Love Your RV! Review. On my upgrades wish list for some time now has been a replacement pin box with built in shock absorption. I often wonder if damage to the fifth wheels frame might take place! Our 1 ton Ford F350 dually has pretty stiff rear springs so the sometimes intense vibrations can get very uncomfortable. We also love to boondock routinely dragging our rig down lumpy or wash-boarded dirt and gravel roads in search of those most scenic of camp spots. Large cracks in the cement roadways and bridges can cause harsh jolts and uncomfortable chucking ( a back and forth jerking or tugging motion). To safely keep up with the flow of traffic slowing down for a rough section is sometimes not an option. I find it particularly annoying when we travel through larger cities where the highways have been badly worn down by traffic. This works well on smooth highways, but things can get a bit jarring when the roads get rough. Our Keystone Cougar 276RLS trailer came with a basic solid steel pin box.
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