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Old 05-09-2016, 02:19 AM   #1
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Fifth Wheel hitch location

I bought a used drw f350 with rails mounted in the bed. When we upgraded from bumper pull to 5th wheel, the seller gave us the reese 20k slider hitch. Have a lot of bouncing so installed air bags. When I was installing the bags and shocks, I noticed the front rail is inline with the rear axle. This places the hitch almost 8 inches behind the axle. I have only towed once with airbags set at 35psi and towed nice on smooth surface at speeds, but bounced when over concrete ir changing speed.
Do I need more psi in airbags? Do I need to move the rails forward to center the hitch over the rear axle?

5th wheel is xlr 380amp tri-axle.

Thanks for helping!
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Old 05-09-2016, 05:22 AM   #2
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Is the truck a short or long bed? Just curious, I don't think in either the hitch should be so far back. On my Ram 3500 dually, the hitch is about 2" ahead of the axle.
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Old 05-09-2016, 06:13 AM   #3
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The hitch should be in front of the axle.
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Old 05-09-2016, 06:56 AM   #4
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usually within an inch or so of axle center. Not sure what year your truck is, but looking at instructions for a 2011 and up F350, the rails are a inch or tow forward of the axle center. I'm sure you will notice a big difference when you correct this. http://www.etrailer.com/instructions.aspx?pn=C16424-204
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Old 05-09-2016, 07:54 AM   #5
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It is a long bed. I looked at Google results lead me to etrailer web site. From what I read, the pin should be 2 to 4 inches in front of the axle which means my rails are about 8-10 inches behind where they should be.
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Old 05-09-2016, 09:56 AM   #6
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Yup, get that corrected and you'll notice less front-end float - especially with the pin weight on that AMP.

When installing, they must not have used the custom brackets - maybe they cheaped-out and used generic angle brackets without knowing what they were doing. On mine, with the custom brackets, it would have been impossible to get the positioning wrong because they only mount to the frame rails one way and then the holes for the rails are automatically in the right places.
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Old 05-09-2016, 12:26 PM   #7
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Quote:
Originally Posted by jb4xx View Post
I bought a used drw f350 with rails mounted in the bed. When we upgraded from bumper pull to 5th wheel, the seller gave us the reese 20k slider hitch. Have a lot of bouncing so installed air bags. When I was installing the bags and shocks, I noticed the front rail is inline with the rear axle. This places the hitch almost 8 inches behind the axle. I have only towed once with airbags set at 35psi and towed nice on smooth surface at speeds, but bounced when over concrete ir changing speed.
Do I need more psi in airbags? Do I need to move the rails forward to center the hitch over the rear axle?

5th wheel is xlr 380amp tri-axle.

Thanks for helping!
Before going to all the trouble moving the rails, I would contact Reese directly and ask for their input.
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Old 05-09-2016, 12:34 PM   #8
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When I mounted mine instructions were to set pin 1 inch forward of axle centerline. I have had no problems.
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Old 05-09-2016, 12:37 PM   #9
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Old 05-09-2016, 12:46 PM   #10
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F250 pin sits 3" in front of axel. Seems difficult to mount it that far back
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