valhalla360
No paticular place.
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RoyJ wrote:valhalla360 wrote:A monster truck camper with 1000-1500lb 6-8ft behind the axle gets rocking, it can put drastically more bending force on the frame.
It may visually appear that way, but the EC 1165 does NOT put thousands of pounds that far back from the axle.
Google its COG: 61.5", or roughly 5' measured from the front of the bed. That puts it right on, or a hair behind the rear axle.
Let's say it's 6" behind the rear axle: 6000 lbs x 6" = 36,000 in-lbs of moment. Assuming the typical hitch ball is 4' from rear axle, 36k in-lb/48" = 750lbs.
So the bending stress of a EC1165 is the same as 750 lbs of hitch weight. Who'd worry about that on a modern dually?
Empty & built to theoretical design standards sitting stationary...true.
Truck campers are notorious for being overweight by a significant amount and no guarantee the extra weight was evenly distributed.
Also, there are some substantial storage compartments all the way at the back. If he loaded it stern heavy, it could easily be an extra 500lb 6ft behind the axle (3000ft-lb).
Then you have the center of gravity well above the axle and frame. The forces on the ball when braking are generally at frame level. So when you brake hard, the force is in line with the frame putting it into compression not bending (0ft-lb). A truck camper with a COG a couple feet above the frame develops a moment arm. Under hard braking...6500lb * 2ft = 13,000ft-lb.
Realistically, probably multiple factors. Going down a smooth straight road at a steady speed, likely no problem grossly overloaded. Slam on the brakes just before hitting a big tope while overloaded with a frame that has had some holes punched in it for tie downs...the overloading may be an issue.
That's the problem with load ratings. The engineers generally assume a worst case scenario and people get away with overloading because actually experiencing that worst case is rare...but when you hit that worst case, the poo hits the fan.
We'll probably never see it but I would still like to see the actual weights and what the frame looks like at the failure. I'm betting with that info, it becomes obvious what happened.
Tammy & Mike
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ford truck guy
Pennsylvania
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Grit dog wrote:ford truck guy wrote:goducks10 wrote:A, B , C or D Topes?[/quote ![[emoticon]](http://www.coastresorts.com/sharedcontent/cfb/images/biggrin.gif "biggrin") ]
By the damage, I would have to guess DD at minimum
So ole boy was trying to motorboat some topes with his big dooley. And ended up going limp?
Me-Her-the kids
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time2roll
Southern California
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Especially watch for these:
![[image]](https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQ9B-VsOGsRr6WgotocQmCAZ6dysGBlno5Wxw&usqp=CAU)
![[image]](https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQWOu5DzIxQAII3DJjXdFAeos4-SrFfmUD13g&usqp=CAU)
2001 F150 SuperCrew
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Cummins12V98
on the road
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deltabravo wrote:Cummins12V98 wrote:The OP has been silent on what happened. I will bet one of the BIG speed bumps were the cause.
OP, what say you?????????????
The OP has no idea what caused the damage because it's not his truck, which he mentioned in a different post when someone else asked about it.
I saw the photo in a FB group I'm in. Someone found it in the Eagle Cap FB group and saved it, then reposted it.... same deal that happened here.
OK, thanks!!!
2015 RAM LongHorn 3500 Dually CrewCab 4X4 CUMMINS/AISIN RearAir 385HP/865TQ 4:10's
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