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Open Roads Forum  >  Truck Campers

 > Truck Campers- Center of Gravity (COG)

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jgaylor

Dewey, Arizona

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Posted: 10/29/04 04:10pm Link  |  Print  |  Notify Moderator

Thanks, Brian

I think Brad told me once

For each 1” you move the camper back, you will move about 30 lbs from the front axle to the rear.


Retired Boeing Computing Professional 6/99 Renton Washington.

Jerry & Roberta, and Bandit.

2006 Pleasureway Plateau (purchased 11/23/2006) Loaded With All options.




RobbyGM

Mason,Michigan

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Posted: 10/31/04 02:33am Link  |  Print  |  Notify Moderator

Our lance 845, COG is 49in from back forward
Chevy 2500HD shortbox , tag in glove box says ( A = 65, B = 0 )
both measured for end of box forward
do you think chevy messed up on print tag .daaaaaa
i work for GM i know we never make any mistakes LOL
anyway 49" forward puts my COG in front of rear axle, no problem


2003 Silverado extcab,4x4 short box
2500HD 8.1L, Allison trans
2001 Smokercraft 18ft, 115 hp 4 stroke
2004 Lance 845

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silversand

Montreal

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Posted: 10/31/04 08:47am Link  |  Print  |  Notify Moderator

Center of mass rather than COG:

I still think that the center of mass should be required data given for all TCs --as well as COG. Although COG is an absolute necessity, the TC's wet center of mass will tell you much more about the TCs shortcomings in terms of build/weight/balance planning, and critically: where you want to be placing your baggage to offset (potentially) poorley designed wet off-center campers.

For example: if Camper X has a center of mass 25-inches high, 20-inches left of camper center of the COG (COG: under fulcrum), you'll need to load it more heavily on the floor on the camper's right side. I would think (theoretically speaking) that it would be better to have a loaded balanced camper than simply pumping-up the offload (bad center of mass) with an airbag.


Silver
2004 Chevy Silverado 2500HD 4x4 6.0L Ext/LB Tow Package 4L80E Michelin AT2s| Outfitter Caribou

mountainkowboy

Socal/NE Oregon

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Posted: 10/31/04 08:19pm Link  |  Print  |  Notify Moderator

AF puts a COG arrow on there units, and I beleive each unit is done as equiped. On my Dodge the arrow is 1" infront of my rear axle center.


Chuck & Ruth with 4-legged Molly
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hopak

Point Reyes Station, Ca. / Crestone Co.

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Posted: 10/31/04 11:57pm Link  |  Print  |  Notify Moderator

COG for the Lance 1030 is 44" from front edge of camper, back toward the rear wheels.. Putting the COG on my F350 extended cab LB 4x4 diesel 2" behind the the front edge of the rear tire. Considering the total hangover of some 2'11 I'm happly supprised.

But what is bothersome is the side to side sway even with Ranchos and air bags.


2002 Dodge,diesel, 3500,4x4,auto/od,ex,cab, 01 Bigfoot 25c 10.5

Raften

Northern Calfornia

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Posted: 11/01/04 12:27am Link  |  Print  |  Notify Moderator

Hopak, where did you get the 44 inch number from. Did Lance tell you it is measured from the front.


'01 Dodge 3500 CTD, Lance 1121, Air Bags, Rancho 9000, All Wheels Under Power When Needed, A Few Engine Mods For Increased HP

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hopak

Point Reyes Station, Ca. / Crestone Co.

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Posted: 11/01/04 07:49am Link  |  Print  |  Notify Moderator

Yes From the Lance Consumer info sheet that comes wt the 1030; however its confusing. Measureing from front to back specs call for 44" but from rear to front its 52". 44" measurement put COG at the leading edge of tire; 52 " measurement COG is at leading edge of wheel bolts????

RoyC

fremont, CA, \USA

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Posted: 11/01/04 09:49am Link  |  Print  |  Notify Moderator

From Lance website:
"The posted center of gravity of a camper is determined by measuring from where the camper contacts the rear of the truck bed (tailights) measuring forward."

Note it is not measured from the back of the camper - unless your camper is the same length as the bed.


2004 GMC 3500 SRW 4X4 Duramax/Allison
2003 Lance 920
Vision 19.5 wheels with Michelin xze 245's



Raften

Northern Calfornia

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Posted: 11/01/04 11:57am Link  |  Print  |  Notify Moderator

The info I posted from Lance did not come from the website, it came from one phone call and two emails. It just made no sense to me to measure from the back but the person I was talking to insisted it was so. I think I needed to find someone there with more knowledge.

I searched all my paper work last night and did find a seperate sheet that gave the lenghts from both front and back. I am ahead ofthe axle centerline on both measurements and in fact never worried that I would not be. I just became conerned after reading the posts about COG. I was mostly concerned because I could not find definative info from Lance.

Fact is I am still over weight with the rig and it handles well.

jade04

Elkhart, Indiana USA

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Posted: 11/02/04 06:37am Link  |  Print  |  Notify Moderator

I agree with "Silversand" about the center of mass...

My camper is a 1994 and does not have a COG marked..
I balanced it on a sawhorse to find the COG by trial and error.
Does anyone have a "Formula" to calculate the COM ?


[b]2000 Chevy Silverado LE 1500 Std. Cab, Long Bed [b]1994 8' Comfort Camp. slide in truck camper [b]2001 Four Winds Majestic 23A Class C Motor Home Our Summer Place Woodland Park 12 X 38 Park Model Trailer at Sandy Pines Camping Resort.[url=http://www.sandypines.com/]Sandy Pines[/url]

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