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Old 10-16-2015, 12:31 AM   #225
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Southern , Colorado
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Originally Posted by bono View Post
mikapen - thank you for the info. I am not a Mercedes expert, but might be interested in GL, if BMW X7 is not appealing when it is launched. So you are saying that the inserts are only available when you order towing package from the factory? Interesting.
I am getting mixed messages on the reinforcement being available only on the Factory INSTALLED hitch.
At one time the hitch could be ordered aftermarket and installed by the Dealer for $2,700, and I was led to believe that it included "some" internal reinforcements. There was significant removal of bumpers and body panels, and a substituted rear SAM. Then, with the 2010, the dealer-installed option went to <$500, but nobody I know ever saw a kit.
The diagram I referred to earlier showed an exploded picture with something that kind of resembled the pic I posted above, and the non hitch exploded diagram lacked the reinforcement. I still can't find that diagram.
I don't know if the GL kit I posted would be the same as installed at the factory or not, or if is even still available.
So, in answer to your question, I'm not sure any more

2010 M-B ML350 Bluetec
2011 Lance 2285 27' TT
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Old 10-16-2015, 12:44 AM   #226
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Originally Posted by rostam View Post
This is not about "setup" (whatever that means). There is not a single unibody vehicle in the market with a 800# or more hitch rating. And most ban the use of WDH. 1000# hitches are readily available. Why wouldn't the manufacturers put them on their unibody vehicles? Well, for a substantial hitch, you need a frame to mount the hitch to. You also need a frame to do substantial weight distribution.
Germans seem to have a different scheme for rating their hitches.
In every one I have seen (Audi, M-B, VW, M-B) the tongue weight rating is exactly 8% of the trailer weight.
And it may be that since WDH's are a recent arrival in Europe, they just haven't tested or certified their hitches for Weight Distribution. Everything is so regulated over there - maybe their lawyers advise never to use WDH in a sentence!
They also construct their trailers a lot differently, with few dual axles.
I think one of the components of their gross weight rating is the ability to accelerate the load, not TV axle capacity.
I have given up on trying to guess how it all comes together, and rely on the Gross Axle Weight Ratings, some work at the scales, and math to predict suitability. And loading.

As for the need for a frame, if that were the only qualification for load-carrying, we'd see 747's raining from the skies.

2010 M-B ML350 Bluetec
2011 Lance 2285 27' TT
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Old 10-16-2015, 11:54 AM   #227
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Ojai , California
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Originally Posted by ciparis View Post
The biggest thing I think the Mercedes diesels would benefit from for towing would be an engine brake. That's been the biggest revelation for me when driving the Ram 2500.

It's rare for the massive torque to make a go / no-go difference (it has happened), although the general ease of pulling is notable and welcome. Crosswind resistance and overall stability when towing come into play fairly often. Raw payload capacity, sure. But the engine brake -- that's where it's at.
Another engine brake refreshing. You do realize that most of this group will look down their collective noses at a mere "exhaust brake" They wouldn't know what to do with one..."except piss off their neighbors"!

PS: Remember, the "massive torque" makes "the ease of towing" possible.
Dave & MJ
1988 32' Excella 1000 (Beauty)
1999 White Dodge SLT Laramie 3500 Dually, 4x4, 5spd, 5.9 CTD 260k+ (The Beast)
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Old 10-16-2015, 11:09 PM   #228
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Originally Posted by Tuco View Post
PS: Remember, the "massive torque" makes "the ease of towing" possible.
Indeed; that's what I wrote

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