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Open Roads Forum  >  Fifth-Wheels

 > Top of fifth wheel plate to bed side rail height difference?

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jims1

tx

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Posted: 09/26/12 05:40pm Link  |  Print  |  Notify Moderator

My plate is 52 inches off the ground.
Bedrails are 54 1/2 at the axle. My old CarriLite runs 1 inch nose high measured from the rv frame at all 4 corners.
I have 7" of clearance.

Truck is 2006 4x4 Dodge 2500
1996 Carrilite


'98 Volvo with a Cummins
'09 36MAX1 Carrilite
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Billieg2

Lake Wales Fl

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Posted: 09/26/12 05:42pm Link  |  Print  |  Notify Moderator

It doesn't really matter what height your hitch is as long as you have 6" - 8" clearance from the truck rails to the top of the 5th wheel when hooked up. All this measuring is useless unless you hook up and measure your space. The 5th should also be level when hooked up. Everyone will be different with different set ups so what you are asking is totally useless.


In my life I've spent my money on women, booze, Harleys, guitars and traveling, the rest I just wasted...

2007 Ford F-350 diesel/dually & Sunnybrook Titan KSRV 39-1 Toy hauler 5th wheel hauling my custom Harley


BigToe

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Posted: 09/28/12 03:23am Link  |  Print  |  Notify Moderator

jims1... THANK YOU!!!

Your response was richly informative, and mightily appreciated.

It was thoughtful of you to point out the age of your Carrilite as well, because age is likely a relevant factor in why it runs 1 inch nose high. It appears that 5th wheels ran lower average hitch heights in the mid-nineties and previous, matching trucks of the era that ran lower as well.

And it was surpising how close your stats are to what i am setting up...

plate height from ground 52 vs 51.5
bed side height from ground 54.5 vs 54.75
plate to bedside difference 2.5 vs. 3.25

This data was very very helpful to me, as it helped fill in the range of how a modern pickup truck might be dimensioned in these regards.

Thanks again!

jims1 wrote:

My plate is 52 inches off the ground.
Bedrails are 54 1/2 at the axle. My old CarriLite runs 1 inch nose high measured from the rv frame at all 4 corners.
I have 7" of clearance.

Truck is 2006 4x4 Dodge 2500
1996 Carrilite


BigToe

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Posted: 09/28/12 09:08am Link  |  Print  |  Notify Moderator

Oops, I let the bottom of the second page to this thread slip by unnoticed...

Thank you!!! to 45Ricochet and mfdchief for your hitch plate to bed rail vertical distances.

45Ricochet, it was an eye opener to me to learn that your hitch plate sits as high as it does in your Ford Superduty (only 2" difference, the smallest difference reported thus far). What brand/type of hitch do you have? Is it set at it's highest position?

Now please bear with me on this next stairstepping conditional question:

If the hitch in the truck is adjustable, and,
if it's plate can be lowered, and,
if the pinbox on the fiver is adjsutable, and,
if it's pin can be lowered, such that
the distance between bed rail and trailer bottom remains the same (6"), while
the connection point between pinbox and hitch plate is lowered, then
what are the other reasons for not lowering the hitch point, where
the bedrail to trailer distance remains unaltered?

Cummins12V98

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Posted: 09/26/12 06:16pm Link  |  Print  |  Notify Moderator

Billieg2 wrote:

It doesn't really matter what height your hitch is as long as you have 6" - 8" clearance from the truck rails to the top of the 5th wheel when hooked up. All this measuring is useless unless you hook up and measure your space. The 5th should also be level when hooked up. Everyone will be different with different set ups so what you are asking is totally useless.


Man you took the words right out of my mouth!

The question is of no value, space between the bed rails and the bottom of the 5er overhand is all that matters!

Not trying to be a jerk but that is the way it is!


2011 Ram Laramie Longhorn 3500 Dually Long Bed, Cummins 350/800 HO, Towin Machine
B&W Companion Hitch, Maghytec Trans and Rear Dif Covers, AMZ/OIL Top To Bottom
2007 1/2 Mobile Suites 36 SB3 27,000# Combined

Coyotecprs

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Posted: 09/26/12 07:04pm Link  |  Print  |  Notify Moderator

Most non sliders that i have are between 13 to 17 inches above the bed. A sliders minimum height is usually higher


2005 Dodge Ram 2500, 5.7 Hemi
2007 Jayco Jay Flight 30.5 BHS

jetboater454

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Posted: 09/28/12 09:45am Link  |  Print  |  Notify Moderator

BigToe wrote:

then
what are the other reasons for not lowering the hitch point, where
the bedrail to trailer distance remains unaltered?


On some with a long hitch on the 5'er it could hit the side of the bed while turning on uneven terrain. Not all have a bend at the back of the tongue.



That's my guess anyhow.


Other half is camping with the angels,Riding alone for now.

2008 3500 Dodge Ram CTD dually 4X4 SOLD
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redsb3

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Posted: 09/28/12 09:53am Link  |  Print  |  Notify Moderator

Cummins12V98 wrote:

transamz9 wrote:

Cummins12V98 wrote:

F105 wrote:

netjam wrote:

Mine is 3.5". I have a 2012 F-350 with a Reese 25K Elite set to the factory (one from the lowest) setting. Other info, you did not ask for....54" ground to top of pickup box. 58" to bottom fiberglas trailer overhang from ground when trailer is level unhitched. When hooked up the truck sinks a bit giving me almost level towing and 5-6" clearance between trailer and truck box.


I once read that between 4-6" between the top of the P/U bed rails and the underside of the FW is the target to shoot for. I have a Ram 2500 and a Husky 16KS and I am within that range with mo problems.


6" is a minimum safe clearance.


Where do you get this info????


Years of installing different 5th wheel hitches, personal real world experience. Also a friend that is a professional trailer fabricator and hitch installer. Go less if you want, not a good idea. Also people think that the center of the hitch can be behind the center line of the rear axle. The correct position is 2" ahead of center of rear axle.


That's a pretty broad statement that is not correct for all hitches.
When I installed my Valley Glider in my GMC, they included specific instructions on how to locate the hitch and where to install the brackets. The centerline of the hitch is precisely 1 inch in front of the centerline of the axle. So when installing, you need the correct manufacturer instructions and need to follow them exactly.


2005 GMC Sierra SLT CC/SB with 6.6L Duramax/Allison
2002 Automate 5W, 32 ft, 13,280 GVWR
Valley Glider Hitch

45Ricochet

North Idaho

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Posted: 09/28/12 10:25am Link  |  Print  |  Notify Moderator

BigToe wrote:

Oops, I let the bottom of the second page to this thread slip by unnoticed...

Thank you!!! to 45Ricochet and mfdchief for your hitch plate to bed rail vertical distances.

45Ricochet, it was an eye opener to me to learn that your hitch plate sits as high as it does in your Ford Superduty Actually its a Ram truck (only 2" difference, the smallest difference reported thus far). What brand/type of hitch do you have? Standard Reese 20k 4 way pivot. Is it set at it's highest position? YES

Now please bear with me on this next stairstepping conditional question:

If the hitch in the truck is adjustable, and,
if it's plate can be lowered, and,
if the pinbox on the fiver is adjsutable, and,
if it's pin can be lowered, such that
the distance between bed rail and trailer bottom remains the same (6"), while
the connection point between pinbox and hitch plate is lowered, then
what are the other reasons for not lowering the hitch point, where
the bedrail to trailer distance remains unaltered?


Yes many different ways to adjust things. I started out with only 4" clearance for the first couple of years, what a PITA pulling into driveways. You have to factor in clearance, trailer riding level, trailer axle weights can even change. IIRC when I adjusted mine the pin weight dropped close to 200 lbs and my rear trailer axle gained that amount. Do the simple things first as in hitch adjustment, followed by pin box and finally trailer suspension. Some guys even go so far as to take out TV blocks (if present) to lower hitch height.


06 Ram 3500 CC LB Laramie 4x4 Dually 5.9 Cummins Smarty Jr 48RE Jacobs brake
GVWR 12,200 RAWR 9350
06 Grand Junction 34' High profile 15500 GVWR 3200 pin Mor/ryde 5500 Onan genny Dual A/C Wet bolts
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Cummins12V98

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Posted: 09/28/12 07:20pm Link  |  Print  |  Notify Moderator

Okay, I was bored so I decided to play.

Top of rails to top of B&W Companion hitch is 5 1/2" I have about 7" of bed clearance.

I did have 3 1/2" top rails to hitch but lowered because I added the Tri Glide to my TrailAir air ride King pin, it adds 2". Actually lowers the king pin.

So now my B&W is at the lowest setting.

My springs are in the lowest holes on the 5er.

Top bed rail off the ground unloaded is 57 1/4" measured at the center line of the rear wheels.

Did I miss anything?

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