Anyone towing a big load? Did you reinforce the factory hitch?
- Mark
2002 Boss Hoss Trike 1500 lbs
2002 Boss Hoss Bike 1000 lbs
2006 Boss Hoss Bike 1000 lbs
2006 Triumph Rocket III 750 lbs
2003 Honda VTX 1800R 750 lbs
i am estimating here. I am close to 5000 lbs but not dead on. And this is PACKED with the trike all the way in the nose and the 4 staggered very closely. I don't usually pull all of these. I usually pull just the BOSS HOSS products.
And the trailer is the one in the pic. I don't know exactly what it weighs but you can get an idea. The trike in the v-nose makes it pull really good. It gives it just the right balance and plenty of tongue weight. You need a little weight on the tongue to keep the sway out.
I used to have a hybrid tahoe and it did very well. EXCEPT it would sway. I actually had to use a camper hitch with a sway bar hooked up. When I started using the Mercedes ML and GL i never had a problem. I haven't even used the sway bar since. Both are 4-matic. I am wondering if this helps the sway?
The Tahoe was always under a bind. It was also governed at 98mph.
I usually pull it at 85 on the interstate. Maximum 90
Didnt mean to come off like a madman....
I actually would agree with you. I only tried it in the triple digits a couple of time. There is a road "hwy. 24" it is a straight 4 lane with a huge grass median. It hardly every has a car on it. I was on it when I tried it. I was so impressed with the 550 power. I could easily run 110 with no effort. I poked 120 for a few seconds. Everybody has to see what is possible once in a while
The Tahoe was always under a bind. It was also governed at 98mph.
I usually pull it at 85 on the interstate. Maximum 90
Didnt mean to come off like a madman....

Thankfully, it appears that you are nowhere near me. 
Bad things happen when a trailer tire blows at 65mph, I'd hate to see what happens at 100mph.
Glad to hear of the positive experience though. I too am going from a Tahoe (non-hybrid) to a GL and looking forward to it.
I have not reinforced my stock receiver, however it has definitely been redesigned by MBZ since the other pics in this thread were posted (I put up a pic of it in another thread a while back).
This is an exceptional tow vehicle - WAY, WAY better than my 2007 Escalade ESV was. I could not be happier.
Some mileage comparisons using the same trailer and route at 62 mph:
7.5 mpg - 2007 Escalade ESV
10.50-11.0 mpg - 2002 GMC 2500HD Duramax diesel
12.0 mpg - 2011 Mercedes GL350 Bluetec
Note that I also use a ProPride 3P Hitch, which is TOTALLY worth the rather lofty price tag. No sway AT ALL. EVER. I would not tow a tag without a 3P hitch ever again (short of a diesel dually pickup). Yes, it's expensive, but my GL350 + trailer + race car come out to a much, much higher total.

http://www.propridehitch.com/
Oh, and for those curious about the car, I attached a pic of that, too.


- Mark
https://www.makariosrv.com/products/...-Products.html
Expensive but so is the GL

If you google the manufacturer milenco, you'll find lots of great reviews of the aero grand. I had to email Milenco to find out where I could buy them this side of the pond.
I mount them with the bar on the top of my mirrors so they have lots of clearance when folded in. Personally tested to 85mph... Very little vibration as advertised.
Last edited by stmeme; Nov 11, 2011 at 02:47 AM. Reason: Damm auto correct!
The Best of Mercedes & AMG
https://www.makariosrv.com/products/...-Products.html
Expensive but so is the GL

If you google the manufacturer milenco, you'll find lots of great reviews of the aero grand. I had to email Milenco to find out where I could buy them this side of the pond.
I mount then on the top of my mirrors so they have lots of Clarence when folded in. Personally tested to 85mph... Very little vibration as advertised.
Ordering now!
- Mark
https://www.makariosrv.com/products/...-Products.html
They rock. If you tow with the GL, buy a set.
Thanks to stmeme for the pointer.
- Mark
I just posted about our good results towing a 27 foot Airstream 3000 miles over the last three weeks in the main towing thread here - https://mbworld.org/forums/gl-class-...ml#post5285609
Question - are you "heavy load" folks watching your tire pressure when towing? My rear tires heated up to where they were running at 45 to 46 PSI at freeway speed on hot (100+ degree) days - vs. 38 PSI cold. Anyone know if this is problematic? I have the stock run-flats which are labeled to allow for a max pressure of 51 PSI cold, so I assume I was still way within spec.
Last edited by ddruker; Jul 17, 2012 at 04:38 PM.
- Mark
As you can see, there are two (one on each side) 1/4" thick triangular steel supports welded from the main hitch bar to the receiver drop down. Then, they welded a 2" square tube to a flat piece which is then welded to the back of the receiver drop down on one end and to a flange on the opposite end. The flange is then bolted to the suspension cross-member with two grade 8 bolts. Since the 2" square tube goes from the receiver to the cross-member, it goes above the air tank, which is dropped down about 2" with "bolt extenders".
This looks like it should now tow anything I want up to the 7,500 lb max, while still exceeding the OEM 600 lb tongue weight limit. With this drop down supports on both sides and the 2" tube to the suspension cross-member, it is much stronger now. Also, with the way this shop did it, it looks like it was standard from Mercedes! (at least to me). Also, I called Mercedes support, and they did say you can use a weight distribution hitch with the OEM hitch.
Last edited by joelans; Jun 20, 2013 at 06:01 PM.
Last edited by hbillsmith; Dec 17, 2013 at 06:07 PM.
UPDATE: December 2015 - MB Auto leveling airbags failed, oops $1400 repair bill. Turned out that using a leveraging weight distribution hitch with the MB GL's airbags puts extra stress on that system and after a few thousand miles towing, it will fail. You cannot turn off the autolevel. The end of this story is I now drive a GMC 2500HD and tow a fifth
UPDATE: December 2015 - MB Auto leveling airbags failed, oops $1400 repair bill. Turned out that using a leveraging weight distribution hitch with the MB GL's airbags puts extra stress on that system and after a few thousand miles towing, it will fail. You cannot turn off the autolevel. The end of this story is I now drive a GMC 2500HD and tow a fifth
How did your hitch receiver hold up? Did it ever have any cracks or deformations? I am thinking of getting an Andersen hitch, and like to know if its hard on the receiver or not.
Thanks!




Sorry to hear about your air suspension issues. They seem to happen to vehicles that do not tow as well. Towing, of course, will exasperate the issue.
How did your hitch receiver hold up? Did it ever have any cracks or deformations? I am thinking of getting an Andersen hitch, and like to know if its hard on the receiver or not.
Thanks!
We tow a 27' travel trailer, @6,000 lbs and @620 lbs on the tongue.
It doesn't make sense that a WDH would be harder on an air suspension, since it reduces load on the rear suspension and should require less leveling from the air system.
Regarding the Andersen, yes, it does increase strain on hitch parts, because it's urethane bushing has much less range of motion than a conventional spring bar WDH. So going through big dips like approaching some gas stations puts an enormous front-to-rear twisting load on the hitch and its mounting points.
The Andersen's are reported by many in Travel Trailer forums not so transfer as much weight as conventional WD hitches, but they are very good at controlling sway.
I think any factory-installed hitch since since 2010 has the increased reinforcement, and wouldn't expect stress cracking.
We just removed the Hitch-to-Differential reinforcing tube that Can-Am RV Centre installed. We had to do that for a warranty fix on the AdBlue heater. Not sure if it was needed on our 2010 - we may measure deflection when tightening our WD bars soon.
By the way, our EaZ-Lift, with trunnion spring bars and friction sway bars is a superior system.
Our ML Bluetec is towing champ. Possibly better than a GL because of the shorter rear overhang, which improves stability (ratio of rear overhang to wheelbase).
We tow a 27' travel trailer, @6,000 lbs and @620 lbs on the tongue.
It doesn't make sense that a WDH would be harder on an air suspension, since it reduces load on the rear suspension and should require less leveling from the air system.
Regarding the Andersen, yes, it does increase strain on hitch parts, because it's urethane bushing has much less range of motion than a conventional spring bar WDH. So going through big dips like approaching some gas stations puts an enormous front-to-rear twisting load on the hitch and its mounting points.
The Andersen's are reported by many in Travel Trailer forums not so transfer as much weight as conventional WD hitches, but they are very good at controlling sway.
I think any factory-installed hitch since since 2010 has the increased reinforcement, and wouldn't expect stress cracking.
We just removed the Hitch-to-Differential reinforcing tube that Can-Am RV Centre installed. We had to do that for a warranty fix on the AdBlue heater. Not sure if it was needed on our 2010 - we may measure deflection when tightening our WD bars soon.
By the way, our EaZ-Lift, with trunnion spring bars and friction sway bars is a superior system.
I don't want to start an argument here -- we are all friends
-- but IMO the effect of rear overhang to wheelbase ratio on trailer stability is greatly exaggerated. I did a Google search for GL and ML's dimensions and for GL the ratio is 0.37. For ML the ratio is 0.34. Do you really think 0.03 makes any difference in towing stability? This is one of many myths that people swear by in Airstream forums -- They have repeated it so many times, they ALL believe in it now.




Glad to see you have good results with your ML.
I don't want to start an argument here -- we are all friends
-- but IMO the effect of rear overhang to wheelbase ratio on trailer stability is greatly exaggerated. I did a Google search for GL and ML's dimensions and for GL the ratio is 0.37. For ML the ratio is 0.34. Do you really think 0.03 makes any difference in towing stability? This is one of many myths that people swear by in Airstream forums -- They have repeated it so many times, they ALL believe in it now.Others think that the wheelbase of the tow vehicle vs the length of the trailer determines stability.
But physics shows that the rear overhang to wheelbase is the important ratio. TV WB to trailer length is not a part of the equation - the TV only sees the trailer as a mass. It's not a myth, it's a noticeable fact. You CAN feel the difference even a shorter shank makes.
In any case, I don't think 1/2 Ton pickups are as capable tow vehicles as a good stout SUV. Plus you can't park the darn things - too long. For me, the GL is to long to tow with, too. For my use the ML is superior. YMMV.
Last edited by mikapen; Mar 17, 2016 at 03:29 AM. Reason: add stuff







