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COG educational thread

Kayteg1
Explorer II
Explorer II
The topic about COG got closed for reasons I don't have to understand, but IMHO it shows how little owners understand the technical issues.
So big TC owners are between truck manufacturers who recommend camper COG in front of rear axle and camper manufacturers who build big campers with COG behind rear axle.
I am pretty observant with loading and even with all heavy tools, water and other heavy stuff in truck cabin, having only light cloths in camper rear cabinets, my COG still comes behind rear axle.
With empty holding tanks in the rear and full water tank of front the camper takes 200-300 lb from front axle.
That doesn't seem to create immediate problem with my dually, who seem to handle perfectly without modification, but leaves me no margin for carrying waste water as single try proved significant difference in handling.
I understand that we are small group in whole industry but is there anything we can do, like sending group email to truck manufacturers?
I think Ford's "camper package" for dually actually lowers the safety of using the combo and I simply take it that Ford engineers have never seen heavy camper on their design?
We do have good number of educated people on the forum, who COULD make a change.
So shall we?
100 REPLIES 100

jplante4
Explorer II
Explorer II
CLOSED
Jerry & Jeanne
1996 Safari Sahara 3530 - 'White Tiger'
CAT 3126/Allison 6 speed/Magnum Chassis
2014 Equinox AWD / Blue Ox

Buzzcut1
Nomad II
Nomad II
^ snarf
2011 F350 6.7L Diesel 4x4 CrewCab longbed Dually, 2019 Lance 1062, Torqlift Talons, Fast Guns, upper and lower Stable Loads, Super Hitch, 48" Super Truss, Airlift loadlifter 5000 extreme airbags

Kayteg1
Explorer II
Explorer II
What is it with some members who have nothing to add to the topic, yet they have to bring their venom?

jimh406
Explorer III
Explorer III
Yep, this thread is for heavy haulers that need F550s and above. Yeah, that's what COG is about. Seriously? 😄

'10 Ford F-450, 6.4, 4.30, 4x4, 14,500 GVWR, '06 Host Rainer 950 DS, Torklift Talon tiedowns, Glow Steps, and Fastguns. Bilstein 4600s, Firestone Bags, Toyo M655 Gs, Curt front hitch, Energy Suspension bump stops.

NRA Life Member, CCA Life Member

Bedlam
Moderator
Moderator
I was just awaiting the carnage so I get a lucky rabbit’s foot out of what remains.

Host Mammoth 11.5 on Ram 5500 HD

mike_kellie
Explorer II
Explorer II
Don't let this go 11 pages. B-man, it's a rabbit hole slick with "ok, you hang up first" bait.
2015 Host Mammoth triple slide w/ TorkLift Fastguns
2015 Ram 5500 SLT cab & chassis with Douglass 9' utility body

Kayteg1
Explorer II
Explorer II
And again, your assumption about lack of CDL is wrong.
We are not talking about buying F450 for camper alone.
We are talking about camper and heavy trailer.
Without WD bars, that situation will happen and question is how much the bars will help.
My new F350 has 22,000 lb tow rating.
But it is not useable at all once I drop long camper on it.
All becouse of COG behind the axle.

burningman
Explorer II
Explorer II
Nope, I’m not assuming anything. I work with trucks and equipment every day, mostly big stuff (crane trucks) but little ones like 550s and such too.
That setup had to be awful close to 26,000. What the local D.O.T. is cracking down on is people with 450s and 550s pulling trailers with equipment like you described.
When the trailer weighs 16k or so, like I know yours did because I weigh this kind of stuff all the time, it’s real easy to go over 26,000 total and the vast majority of people driving these don’t have CDLs.
There’s also only so much weight you can put on your rear tires regardless of their stated capacity.
D.O.T. doesn’t care. They go by size only.
I’ve got a Peterbilt 385 with tires rated for 10,000 pounds each up front, that are only 325s, and a Peterbilt 367 that has larger 385s up front that are actually rated for LESS than the super heavy duty ones on the 385. D.O.T doesn’t care. They’ll only allow the front to be 14,400 on the smaller ones, they allow a few thousand more on the lower-rated but fatter tires on the 367.
I’ll bet you were pushing it with the rear end weight on your 450 with that nose heavy trailer on.

And still, none of that means a 450 Ford with a diesel won’t easily and comfortably carry about any truck camper made with plenty of front axle weight, even with standard pickup truck axle setback.
2017 Northern Lite 10-2 EX CD SE
99 Ram 4x4 Dually Cummins
A whole lot more fuel, a whole lot more boost.
4.10 gears, Gear Vendors overdrive, exhaust brake
Built auto, triple disc, billet shafts.
Kelderman Air Ride, Helwig sway bar.

Kayteg1
Explorer II
Explorer II
You assume wrong facts to support your theory.
Everything was perfectly legal. Just not engineered too well.
Would F450 had axle moved back like F550 or mentioned camper special, the situation would never exist.

burningman
Explorer II
Explorer II
Yeah, it’s that easy. You weren’t hauling a camper, you were hauling way too much weight with the wrong kind of trailer.
That’s got almost nothing to do with carrying a camper less than half that weight up on the truck deck.
Any trailer capable of hauling a 12,000 lift weighs well over 3000 pounds by itself.
You had a 15,000, probably 16,000 pound trailer, with way too much tongue weight.
D.O.T. around here has been really cracking down on that stuff, lately hardly a day goes by I don’t see a landscaper or whoever in a 450 or 550 pulling a piece of equipment on a trailer on the side of the road with a D.O.T. officer “educating” the driver about what you can and can’t do.
2017 Northern Lite 10-2 EX CD SE
99 Ram 4x4 Dually Cummins
A whole lot more fuel, a whole lot more boost.
4.10 gears, Gear Vendors overdrive, exhaust brake
Built auto, triple disc, billet shafts.
Kelderman Air Ride, Helwig sway bar.

jimh406
Explorer III
Explorer III
7.3 is the lightest PSD by about 200 lbs compared to the heaviest. That doesn't count the transmission. Your facts are wrong, go figure. Again, you add a trailer which is also affected by how you load the trailer. Then there is the flatbed that also changes things. COG, still doesn't matter since you can't change it. Fwiw, the PSD engines are heavier than Cummins and Duramax, so better get rid of those trucks. Joking ...

'10 Ford F-450, 6.4, 4.30, 4x4, 14,500 GVWR, '06 Host Rainer 950 DS, Torklift Talon tiedowns, Glow Steps, and Fastguns. Bilstein 4600s, Firestone Bags, Toyo M655 Gs, Curt front hitch, Energy Suspension bump stops.

NRA Life Member, CCA Life Member

Kayteg1
Explorer II
Explorer II
burningman wrote:
You are fundamentally correct that moving the axle rearward so the camper has less overhang is good for weight distribution and towing.
However, in the real world, a diesel F450 is gonna handle any camper just fine and still have plenty of weight on the front end.....

Not that easy.
My previous F450 flatbed not only had 7.3 Powerstroke, what probably is the heaviest engine you can get on F450, but also had longer wheelbase with 10' bed.
One time I was hauling trailer with one of those 12,000 lb manlift. Due the shape of the machine, I had to put big part of the load weight on hich.
When pintle hook was mounted as close to the axle as it was possible (few inches forward the rear bumper) the trailer weight took so much weight from front axle that my front wheels were skidding on any heavier braking. The truck had ABS only on rear axle.
That made heck of white knuckle driving, where I was using trailer brakes manual override for smoother braking.
That is where I start noticing that it takes F550 to get truck design for hauling, not grocery getting.
And BTW, do F550 with normal bed exist?

burningman
Explorer II
Explorer II
You are fundamentally correct that moving the axle rearward so the camper has less overhang is good for weight distribution and towing.
However, in the real world, a diesel F450 is gonna handle any camper just fine and still have plenty of weight on the front end. Remember, it starts with a whole lot of front end weight already!
As for trailer towing, I sometimes have a 10,000 trailer behind my camper and I achieve the proper physics by stretching my trailer tongue to reach the truck rather than making matters worse by using a hitch extension which does the opposite of what you want to the weight distribution and handling.

If you really want the rearward axle placement, a cab & chassis of the wheelbase you prefer and a flatbed is about the only practical way to get it. But I don’t think you really need it with one of these new trucks.
2017 Northern Lite 10-2 EX CD SE
99 Ram 4x4 Dually Cummins
A whole lot more fuel, a whole lot more boost.
4.10 gears, Gear Vendors overdrive, exhaust brake
Built auto, triple disc, billet shafts.
Kelderman Air Ride, Helwig sway bar.

jimh406
Explorer III
Explorer III
Kayteg1, completely hypothetical since I have a F450, and if we are talking towing, a slight difference in wheelbase with a light truck gets owned by the heavy one even with an improvement of the light one's COG. And ...of course, the COG calculation changes dramatically of the entire rig/trailer. Sounds like apples and watermelons to me.

BTW, there are several people who have noted almost no significant change to front weights when adding a TC. A few inches might be better, but a crew cab longer wheelbase has an advantage over shorter as well. Then, a diesel has more weight on the front as well, so all TC carrying trucks should be diesel right? Just to improve COG ... 😉

'10 Ford F-450, 6.4, 4.30, 4x4, 14,500 GVWR, '06 Host Rainer 950 DS, Torklift Talon tiedowns, Glow Steps, and Fastguns. Bilstein 4600s, Firestone Bags, Toyo M655 Gs, Curt front hitch, Energy Suspension bump stops.

NRA Life Member, CCA Life Member