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Old 02-25-2011, 06:58 AM   #1
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pin box extension on 5th wheel trialer?

anybody with a short bed truck ever use a pin box extension on there 5th wheel trailer? my ford f 250 bed is 6foot 8inch long, which is the longest short bed, if i add a RV5 10inch pin box extension, that should enable me almost 90 degree turn with a 5th wheel trailer that is 8foot wide.
can anyone tell me what % of "pin weight" the extension will shift to the rear of the truck? the only downside i can see is the shfit of weight back 10 inches, which could cause some "sway" in the trailer, like you get with most bumper pull trailers.
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Old 02-25-2011, 07:11 AM   #2
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Another downside is the increased torque imposed by the longer lever arm of the extended pin box to the frame of the 5th wheel. The longer pin box extension acts like a cheater pipe with the pin weight of the 5th wheel working to twist the pin box off the 5th wheel's frame, especially with increased dynamic cyclic loading on rough roads, dips or bumps. Check with your manufacturer (NOT a dealer) to ensure that the pin box extension you're considering is approved by them, especially if your 5th wheel is still under warranty. I've owned a 5th wheel in the past (Jayco 3610RLTS) where only a vertical pin box was approved by the manufacturer - no extensions or offsets were allowed.

A pin box extension will not make the 5th wheel any narrower. For a 96" wide 5th wheel, anything less than 48" (1/2 of the 5th wheel's width) between the hitch's kingpin bore and the back of the cab will result in contact at 90 degrees. How close you can get to 90 degrees before you have contact is the $64 (actually, much more at current body and glass shop rates!) question.

The obvious solution (and I'm sure you know this) is a sliding 5th wheel hitch or a long bed truck.

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Old 02-25-2011, 07:16 AM   #3
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Quote:
Originally Posted by aspeyrer View Post
anybody with a short bed truck ever use a pin box extension on there 5th wheel trailer? my ford f 250 bed is 6foot 8inch long, which is the longest short bed, if i add a RV5 10inch pin box extension, that should enable me almost 90 degree turn with a 5th wheel trailer that is 8foot wide.
can anyone tell me what % of "pin weight" the extension will shift to the rear of the truck? the only downside i can see is the shfit of weight back 10 inches, which could cause some "sway" in the trailer, like you get with most bumper pull trailers.

Any change in the lever arm should be OK'd by the manufacturer not via an opinion or some one else's experience here(unless they have exactly the same trailer and have the OK). You risk frame failure - repairs are expensive!!!

Sorry if I sound negative, but do a search and you will find threads that say it was OK on my Brand 'X' therefore it's OK on your Brand 'Z'. It isn't!!

Now - the flames will begin!!!!
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Old 02-25-2011, 06:28 PM   #4
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The extension will put additional stresses on the pin box to frame area. Most trailers are not over designed at this point. Contact the trailer manufacturer and see what they say...again, not the dealer. Be especially careful with any frame by Lippert.

ken
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Old 02-26-2011, 12:11 PM   #5
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Palomino Puma is built by Forest River, i think they make there own chassis. I called the factory, of course they say it voids the warranty, but what am i going to do? just bought this truck back in June of 2010. If i had to do it again i would buy a F 450 crew cab 4 by 4 long bed dually, and i still might if i find one for a good price, and if they dont screw me on my trade in that i have woned less than a year.

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The extension will put additional stresses on the pin box to frame area. Most trailers are not over designed at this point. Contact the trailer manufacturer and see what they say...again, not the dealer. Be especially careful with any frame by Lippert.

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