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Old 10-25-2014, 07:06 PM   #1
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Reinforced King pin box

After reading about several of the King pin box welds breaking I decided to reinforce mine today. I welded 3x3 3/16 thick angle iron in each corner to allow for more lateral surface area attachment to the cross members both front and back of the Pin Box mount. Pretty simple if you have a mig welder and welding capability. If not I would imagine someone would do the job for about 4 or 5 hundred bucks. Money well spent..Click image for larger version

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Old 11-06-2014, 08:27 AM   #2
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Does this help anyone..


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Old 11-06-2014, 09:52 AM   #3
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Originally Posted by rmkpower1 View Post
Does this help anyone..


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I hope so, might get people to become aware of things that can happen.
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Old 11-06-2014, 01:20 PM   #4
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Good information that you posted.

To do the reinforcing that you showed did you have to remove any of the covering around the pin box, or just the removal of the pin box ?

I assume that you did this in prevention and you did not have any tears or crack in the structural steel ?

Thank you

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Old 11-06-2014, 01:30 PM   #5
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It was preventative measure. I had no evidence of cracks at all but my unit is the 2006 24RL which is lighter than most and it has only 1k miles on it.. I also added structural support and added attachment points to my rear factory installed hitch I tow a boat behind it which is also why the Pin Box attachment strength is double as important. I hope this is helpful. I read this happening to fellow Wildcat owners.


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Old 11-06-2014, 01:31 PM   #6
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I forgot to note all I had to do is the remove the Pin Box for good access, no panels.
Jeff


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Old 11-06-2014, 02:13 PM   #7
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rmkpower1.... Jeff

Thanks for the reply.

I have seen several postings on the Wildcat pin box / frame failures.

It scares the hell out of me !

I've checked mine and see no tears, however, my 2007 has not seen a lot of travel and mostly stayed in a seasonal locations (close to home) then towed home during winter by the original owner, I am the second owner and have not done any long distant travel 'yet'.

I have been wondering ...possibly ..some of the owners with these failures have been loading the forward sections, including basement storage, to the max ...putting extra stress on the weak areas ?

Your thoughts ?
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Old 11-06-2014, 02:33 PM   #8
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rmkpower1..... Jeff

Question:
Regarding this picture (below) the 'bar' that is welded after the angle iron that runs in a downward angle....is it flat bar or angle iron ?...and where did you attach it at the bottom?
Do you have any more pictures?

Thanks
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Old 11-06-2014, 02:44 PM   #9
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I see it as a design flaw not to have substantial unilateral attachment to the cross members. Multi direction will increase tear strength immensely. I should be able to put an uncalculated amount of camping gear etc up front that shouldn't even come into play or make me worry that I am overloaded. Adding the material strength down the face of the crossmember increases the overall strength of the joint. Also has surface attachment requiring an enormous amount of strength compared to factory design. Simple addition to strengthen the area overkill is always better!


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Old 11-06-2014, 02:47 PM   #10
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Can't view the picture is it that flat bar? If it is... It was a factory bar there I cut it loose bent it up to slip the angle in then bent back down and welded it back in place. Really provides no structural strength just there easier to keep it there.


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Old 02-15-2015, 09:30 PM   #11
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What models and years is this an issue I have a 2003 27rl
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Old 02-16-2015, 08:21 AM   #12
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It seems the problem was around the 2006, 2007 model year.

John
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Old 02-16-2015, 08:24 AM   #13
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Quote:
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What models and years is this an issue I have a 2003 27rl
The three on the forum where all 2007 year.....
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Old 02-16-2015, 09:08 AM   #14
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Ok thanks I'll check mine anyway
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Old 02-16-2015, 11:09 AM   #15
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Follow Up.....

I have had a good look at the area in question on my 5th wheel after removing the pin box. (so far so good) .
As I mentioned earlier my 5th wheel hasn't had an overly amount of miles.

I don't think my Trailer is 'immune' to this problem, however, my rig was built in Oregon , at the West Coast factory on a Ziemann Chassis.

I plan to do some additional reinforcing much like "rmkpower1" has done and more on the other side of the pin box and frame webs as well.
This area is accessible by removing the under skin of the over hang.

In further precaution I now have a 'TrailAir Tri-Glide Air Ride' pin box....
..Soon the be road tested.

This pin box will greatly reduce any harsh road bump repercussion compared to the normal 'metal -to- metal' connection.

The 'TrailAir' Pin box will help reduce the stress from bounce and jarring on the frame of the trailer as well as the tow vehicle plus a more enjoyable ride in the cab.
The 'Tri-Glide' portion of the hitch will reduce the 'chucking' , which is common with the heavier trailers, ...I call it...the tug of war between the truck and trailer.
I will try to report my experience with the new TrailAir after my trip.

Oh , and an FYI... The Weld and Frame Failures are not just 2007.... and not just Wildcats..... I have read posts on other forums back to 2004....and even up to 2012...with frame flexing, weld breaks and frame tears.
However...it does seem to be very popular on Lippert Frames....and several Models of 5th wheel trailers that use Lippert frames and components.
From what I have been reading it seems to boil down to : a poor design using a poor grade of thin gauge steel, (high carbon content from China steel) .
Another Note: It is not just the 'Pin Box' (front frame ) area of trailers that have been experiencing failures. Other areas where the frame has been lengthened has seen web tears. (read on other forums)

IMHO.... It is a "beep-beep" shame that Lippert did not do some testing on the light weight and poor grade steel they were using in their frames.
They should be held accountable !

I write this only to caution owners to always inspect their rigs thoroughly in hope that any problem be caught early .

Islander
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Old 03-18-2015, 06:44 PM   #16
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I am glad that they don't use Lippert frames any more on Wildcat fivers.
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Old 05-17-2015, 09:17 AM   #17
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Islander great response... I did go ahead and box in the leaf spring purches to spread the attachment point further down the frame and the spring perch on all of them. Spoke in depth with my local contractors that use very heavy duty trailers to transport directional drill machines here in Denver he does the same thing to all his trailers to avoid the spring perches ripping off the bottom of the frame, it has happened to him on the road not worth the downtime and danger for him. Just an added thought took first trip this year 600 miles pulled double trailer works like a dream like always safer than sorry... The key is when turning hard do it slow and allow for tire slippage to take place and not stress the frame and metal to give..
Have a great summer!!!


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Old 05-21-2015, 12:32 PM   #18
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Follow Up.....

Regarding the installation of my 'TrailAir Tri-Glide Air Ride' pin box.

After my 1st (30 day) trip with my new TrailAir Tri-Glide I am very Happy to report it did everything and more I expected it would.
No more chucking, smooth starts and stops, harsh road dips and bumps cushioned nicely by the air-bag... (as seen in the rear view mirror).

I did a little test by placing some 'loose' items throughout the trailer, on the table, counters and in some cabinets..... normally with the stock pin box even the shortest trip would have sent these things flying.
With the TrailAir Tri-Glide "all" items I set in place for the test remained in place with little or no movement from where I put them.

The ride was much more comfortable in the truck.
The trailer and truck had to have had less stress from road impacts as well.

I contemplated the 5th wheel air bag hitch for the truck, which is quite expensive, but I really wanted to conquer the 'chucking' as well as cushion the ride'...this is why I chose the 'TrailAir Tri-Glide Air Ride' pin box.

Hope this helps
Islander
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Edge programmer, 4" SS exhaust turbo/back,
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Old 05-21-2015, 12:40 PM   #19
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Very nice I had one on my Cardinal 5th wheel great addition very smooth...
Have a great summer if it ever warms up... 40f in Denver today it is freezing...


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