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  #81  
Old 03-26-2018, 06:09 AM
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Quote:
Originally Posted by bono View Post
There is even youtube videos showing this - no problem with opening doors / tailgate in X5, when the car goes off road. Truck frames are flexing in similar situations. This is pure engineering, any car engineer will tell you that unibody is more rigid than body on frame.


It would make sense. The unibody, the entire thing is a stressed member resisting the forces. On a truck with box on frame. Only that narrow ladder frame is really resisting. Seeing it's narrower and longer. I wouldn't be surprised it's stiffer.
I'll tell you what. I had an 06 F250 before this 04 X5 and the X5 feels more solid and stiffer, structurally than any other vehicles I've ever owned.


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  #82  
Old 03-26-2018, 08:36 AM
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I think you're kind of comparing apples to oranges. You're comparing the body part, as in door, tailgate, road feel which will definitely fare better in a unibody. You're not comparing what the physical frame is doing while loaded.
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  #83  
Old 03-26-2018, 12:05 PM
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I am not comparing anything. The question was about unibody and WD hitch. From a technical perspective, there should not be a problem with using WD on unibody, due to general chassis stiffness.
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  #84  
Old 03-26-2018, 12:18 PM
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Quote:
Originally Posted by bono View Post
I am not comparing anything. The question was about unibody and WD hitch. From a technical perspective, there should not be a problem with using WD on unibody, due to general chassis stiffness.

Ok


Quote:
Originally Posted by bono View Post
Unibody is stronger than body-on-frame. The most challenging part are the mounts point for the hitch. Many unibody manufacturers require WD to achieve full tow capacity.


Quote:
Originally Posted by bono View Post
There is even youtube videos showing this - no problem with opening doors / tailgate in X5, when the car goes off road. Truck frames are flexing in similar situations. This is pure engineering, any car engineer will tell you that unibody is more rigid than body on frame.


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  #85  
Old 03-26-2018, 12:22 PM
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That's fine. I do not care about trucks, will never own one, etc., but since many people are using them with WD, I mentioned trucks which are body on frame. Again, the question was about unibody and WD.
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  #86  
Old 11-09-2018, 05:52 PM
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So I've measured the weight of our tow rig on cat scales.... 2011 X5M + 2017 Microlite 21DS

Front axle 2740lbs
rear axle 4080lbs
trailer axel 4840lbs
gross weight 11660lbs

I have a weight distribution hitch.... I did not weigh the vehicle properly to determine tongue weight. But I estimate its about ~950lbs, and we had probably 500lbs in passengers + items in the car. Our estimate is 435 lbs dry tongue (trailer sticker), 40lbs propane, 217bs of batteries behind propane (242*.9). 43 gallons of water near front axle (43gallons x 8.5lbs x .70 apparent weight) 255lbs... + items in the trailer. We had a generator in front of the axles inside...

The axel measures seem to indicate all the hitch and passenger weight went to the rear axel. Curb weight should be 2640lbs on the rear (empty).

So it would seem that our weight distribution hitch was not forcing weight onto the front axle. receiver flex? too weak spring bars (max 750lbs), way off on tongue weight guess, not setting up the wdh correctly? whats interesting is the front axle weight is nearly what I would expect stock..

Anyway I'm learning so don't make any conclusions from this one-setup, and our 1st time weighing..
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  #87  
Old 11-09-2018, 05:55 PM
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I typically weigh 2400/3200 with a fair amount of tools in my truck. If you have 2700 front you are definitely getting the distribution effect from the hitch. When I'm fully loaded I lose weight on the front axle. I've seen 2100 front for example.


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  #88  
Old 11-09-2018, 05:58 PM
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You maybe right. We'd need to weigh our car without the trailer which we didn't do.
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  #89  
Old 11-09-2018, 05:59 PM
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X5 towing experience and fuel economy

It's only $2 for a same day reweigh totally worth the effort. I've used re weigh to weigh left vs right by parking half off the scale also.

WD hitch won't push as much weight to front wheels with auto leveling suspension since the back of the truck will lift itself reducing force in the leaving torque bars.
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  #90  
Old 11-09-2018, 06:29 PM
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Your tongue weight appears to be too high and I would try to go down. You do not need more than 10% TW, unless you tow 80 mph.
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