I have had some bad sways like that with a overloaded trailer, but nothing like that high profile rig.
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1996 F-250 extended cab long box five speed. Home made Tymar, 203 Stat, 60 gal in bed fuel cell, 315/75's, no muffler, ebpv welded open 3" to 3" DP, Babies. 290K, still chugging, and still smoking when cold.
UPDATED 8/1/08 Replace so far. 1 LUK flywheel+clutch, 2 thermostats, 2 set of brakes, 1 set of calipers, 5 CPS, 3 sets of tires, 2 Transfer pumps, 1 Injector modual, 1 Computer, 2 Alt, 2 sets of batteries, 1 Water pump, 6 Belts, 1 PS hose, 2 Sets ball joints, 2 set u-joints, 2 carrier bearing, 2 Speed sensors, 1 oil pres sender, 1 temp sender, 4 sets of e-break cables, 1 front fuel tank, 2 rear fuel tanks, 2 set of glow plugs, 6 Glow plug relays, Oil galley o-rings, Turbo pedistal o-rings, EBPV o-rings, 3 sets of Injector O-rings, 1 Vac-pump, 1 new carpet.Total $$$ in repairs v/s miles driven = 3.0 cents per mile. Add fuel to that it jumps to 14.8 cents per mile over the life of the truck.
That's why you secure a vehicle to a trailer by the frame, not by the axles.
When you secure it by the axles, you have two degrees of freedom (the trailer and vehicle springs, both)
When you secure it by the frame, you have one degree of freedom (the trailer springs only)
I've tried & failed to explain the concept many times, but a video's worth a thousand words. I'm bookmarking that one for eternity.
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Douglas Campbell [drcampbell ot engineer dat kahm]
November 5, 2008: The fat lady sang. Back to actually working for a living.
1986 Isuzu P'up, 177,673.8 miles. Hella headlights, (highly recommended) DOT C-2 back end. (also recommended) R-12 air conditioner converted to R-406a. 4.1:1 rear axle converted to 3.4:1.
9/22/2007, age 21: Still running well when reluctantly sent away for reincarnation, due to body & frame rust.
Last edited by drcampbell : 03-05-2008 at 11:53 PM.
I agree that he failed to secure the load properly. Another thing to consider is his speed. Regardless of how well or poorly a item is secured, the towing speed will play into this. In a situation like this, I'd say that he was probably close to the wieght limit on the trailer and didn't have it placed properly due to the size of the load.
He was very lucky, I'm sure he needed a fresh pair of undies, cause i'd be willing to bet his butt grabbing the seat.
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Mine :01 F-350 CrewCab Lariat 4x4, 7.3 PowerStroke, auto, ShortBox. Mods: 3-Gauage A-pillar W/ Autometer Lunar Guages<boost,pyro,trans> Galaxy DX-33 Radio W/ MonkeyMade steel whip, and Optima RED TOP batts.
By the looks of the video it is secured very well. There is no movement in the load at all.
I am guessing that there was not enough weight up front. That is was caused my problems on a overlaoded trailer, but the weight was only 3' high.
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1996 F-250 extended cab long box five speed. Home made Tymar, 203 Stat, 60 gal in bed fuel cell, 315/75's, no muffler, ebpv welded open 3" to 3" DP, Babies. 290K, still chugging, and still smoking when cold.
UPDATED 8/1/08 Replace so far. 1 LUK flywheel+clutch, 2 thermostats, 2 set of brakes, 1 set of calipers, 5 CPS, 3 sets of tires, 2 Transfer pumps, 1 Injector modual, 1 Computer, 2 Alt, 2 sets of batteries, 1 Water pump, 6 Belts, 1 PS hose, 2 Sets ball joints, 2 set u-joints, 2 carrier bearing, 2 Speed sensors, 1 oil pres sender, 1 temp sender, 4 sets of e-break cables, 1 front fuel tank, 2 rear fuel tanks, 2 set of glow plugs, 6 Glow plug relays, Oil galley o-rings, Turbo pedistal o-rings, EBPV o-rings, 3 sets of Injector O-rings, 1 Vac-pump, 1 new carpet.Total $$$ in repairs v/s miles driven = 3.0 cents per mile. Add fuel to that it jumps to 14.8 cents per mile over the life of the truck.
Forgotto mention that that trailer is now bent beyond use. When they take that load off that trailer is going to bounce something terrible.
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1996 F-250 extended cab long box five speed. Home made Tymar, 203 Stat, 60 gal in bed fuel cell, 315/75's, no muffler, ebpv welded open 3" to 3" DP, Babies. 290K, still chugging, and still smoking when cold.
UPDATED 8/1/08 Replace so far. 1 LUK flywheel+clutch, 2 thermostats, 2 set of brakes, 1 set of calipers, 5 CPS, 3 sets of tires, 2 Transfer pumps, 1 Injector modual, 1 Computer, 2 Alt, 2 sets of batteries, 1 Water pump, 6 Belts, 1 PS hose, 2 Sets ball joints, 2 set u-joints, 2 carrier bearing, 2 Speed sensors, 1 oil pres sender, 1 temp sender, 4 sets of e-break cables, 1 front fuel tank, 2 rear fuel tanks, 2 set of glow plugs, 6 Glow plug relays, Oil galley o-rings, Turbo pedistal o-rings, EBPV o-rings, 3 sets of Injector O-rings, 1 Vac-pump, 1 new carpet.Total $$$ in repairs v/s miles driven = 3.0 cents per mile. Add fuel to that it jumps to 14.8 cents per mile over the life of the truck.
I agree it looks like they strapped it down by the axles. Turns the whole trailer into a second order mechanical system. Looks like they hit a bump or changed lanes and found the natural frequency of the system.
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2002 F250 Crew-Cab Short-Box 4x4 Off-Road 7.3L
283 HP/ 570 Lbs/Ft
BTS Trans
BTS 4-Stage FlipChip
AFE stage 1 Intake System
Silverline 4" T-304 Stainless Turbo-Back Exhaust-Donahoe Racing "Edge 4.5" Plush Ride lift
BFG all terrain 35" tires
I agree it looks like they strapped it down by the axles. Turns the whole trailer into a second order mechanical system. Looks like they hit a bump or changed lanes and found the natural frequency of the system.
I see the truck secured only at the front, with the truck rear axle/wheels being airborne. The trailer axle stays on the ground while whipping back and forth as you hear the truck slamming down on the deck. The tongue weight looks heavy, so I’d guess crosswinds and/or abrupt driver movement kicking it off.
Ok, I'll throw in my 2 cents. The truck on the trailer looks like a Unimog with a box. Pretty heavy truck empty. If the guy bought the truck and also a spare engine, a spare set of axles and put them in the box, you could never get enough hitch weight to prevent sway. I have had this EXACT same thing happen when I hauled a 5 bottom plow a long time ago. I could not get the plow far enough forward on the trailer to make any tongue weight. It seemed OK and I started off down the road. I went several miles before it started whipping, all I did was cross a bridge seam in the road. Things went to hell and I did almost crash the truck. I was able to save the rig by using the overide button on the brake controller and locking the trailer brakes up completely, this straightened the the truck out immediately. I nursed the load the last 3 miles at 15 MPH with my hazards on and 1 finger on the brake controller!
not a unimog same thing but mercedese unimog is boxier mercedes version is smooth lines
but i bet he has the axles and engine in that box too
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88 F-250 body,550 rear frame setup, 7.3 idi, 3:73 dana 80 rear, srw, dana 50 front, heavy duty leaf springs, back up camera, 20$ wallyworld fog lamps, class 5 bumper hitch welded to frame and gusseted, 32" steering tires all around, ac power converter,jeep bucket seats, deezee runningboards (cab only),cobra 29 cb w/ 102" whip, 2 trucklight worklights on front stake pocket each side,high lift jack behind seat, toolbox for the junk, visor, running lights, 6600 lbs with all my junk
2005 Chev Duramax/Allison 3500LS DRW Crew Cab
2006 Chev 6.0L/4L80e 3500WT DRW Ex-Cab 9'Flat-GN
Linear Mode
