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Depending on the Airstream's weight and if it's equipped with brakes, you'll need a brake controller. Check with your MB dealer to see if a heavier rear differential fluid such as 75W-140 is recommended.
All German SUVs are excellent towing platforms up to their rated maximum GCW.
I have towed with MB, VW and Porsche SUVs and the suspension, steering and brakes are solid and confidence inspiring.
I tow at max GCW on my current Cayenne with air suspension, using a weight distributing hitch and Tekonsha Prodigy P3 wired electric brake controller.
The combination is solid as a rock and comfortable to drive, when driven as it should be. Heavy towing requires driving skill.
W465 G550 tow rating is 7000 lbs, a 16’ Bambi is 3500 lbs. The G will handle this with ease.
Do not change any fluid specs, eg transmission or axles. The standard fluids are capable of the vehicle performance specifications.
W465 and current 9Y0 Cayenne have similar wheelbases. The Cayenne is a great tow platform and I believe the G should be as well. GLE has a few inches more WB which would be a noticeable improvement at highway speeds.
Not with a G550 but with a GLS550. You 100% want a brake controller, we are in FLAT FLAT Florida and it still makes a rather large difference. In the Georga and NC hills even more so.
Assuming your tanks are empty (but for propane) you really cant tell it is there just going down the highway with the CC on. I was told to even keep our fresh water tank empty to tow - it only makes sense. We never not ever use the bathroom for anything more than #1 from the young ones...so, have no experiance with full fresh/black/grey water tanks.
Wow! A wealth of information. Thank you all for the great comments! Will send pics when I get it all wired up...
Two questions:
1. Is a wireless brake controller a bad idea?
2. Any recommendations on weight distributing hitches? I was told some vehicles are not compatible with this style of hitch.
Wow! A wealth of information. Thank you all for the great comments! Will send pics when I get it all wired up...
Two questions:
1. Is a wireless brake controller a bad idea?
2. Any recommendations on weight distributing hitches? I was told some vehicles are not compatible with this style of hitch.
Much appreciated!
1. All wireless brake controllers are bad ideas. Lag and glitching. Wired controllers are the pro solution for people who are serious about what they do. Not kidding. Don't get a wireless controller. Get the Tekonsha Prodigy P3, you will not be disappointed. Do you have the factory towing package?
2. Curt, Draw-Tite and Husky are reputable brands. I have used Draw-Tite in the past and now have a Husky setup for the Cayenne. All cars with a 2" square receiver are compatible with a weight distributing hitch. Carmakers want to distance themselves as far as possible from anything related to towing and so disclaim weight distributing hitches. The problem is with a high tow rating like the G, GLE and GLS have, it is impossible to reach the max trailer weight while maintaining GAWR front and rear, without the use of a weight distributing hitch. The weight distributing hitch applies a torque (moment) on the receiver assembly which is bolted to the vehicle body in white (body structure). The vertical down force of trailer tongue load combined with the moment from the WD hitch is quite a task for the body structure. However the W465 is body on frame, unlike GLE, GLS and Cayenne which are unit body platforms.
The W465 is body-on-frame which is perfect for towing, specifically with a weight distributing hitch. Ignore MB's documentation on this, they really don't care about anything except their own liability.
Dealers are less than zero help regarding towing because it is the third rail of consumer automotive endeavors from their point of view. Dealers give either no guidance, or factually incorrect guidance regarding towing.
Text from MBUSA for the Trailer Hitch (standard feature). Looks like you have an electric brake controller pigtail somewhere in the vehicle, likely near the OBD port.
"Trailer hitch
With the standard trailer hitch, you can tow up to 7,000 lbs. The hitch includes the wiring harnesses for the trailer lights and brakes, while every G-Class is factory-equipped to handle the rigors of towing on the engine, cooling system and transmission. Standard Trailer Stability Assist helps keep trailer sway under control."
@chassis thank you for the lengthy reply. Super duper helpful. You’ve given me the confidence to give this a shot!
Helpful description of the WD hitch. Thanks!
Another suggestion is to use sway control. This is an added device which attaches on one end to the trailer and on the other end to the hitch drawbar. In the simplest form it is a friction device that dampens yaw (lateral) motion mainly at highway speeds.
I have used a friction sway control device for 20 years and it is simple and effective.
Not quite the same thing... but FWIW, I had a 2019 G63 (now 2025) and I towed a car hauler with a bmw m3 on it from Scottsdale to Los Angeles and back over a weekend, in the summer when it was 110+ degrees.
I had zero issues, nothing concerning, no surprises. At the time my G63 had about 50K miles on it. Like I said not quite the same story, but thought id offer my experience. and I would have no hesitation about doing it again.
I want to say the trailer was maybe 18-20 ft also. Probably 1500-2000lb trailer and the M3 3500-4000lbs. So I was towing anywhere from 5000-6000lbs through the desert up the hill from Palm Springs in to AZ on the way back. probably 8-900 miles total over a weekend with zero problems.
Not quite the same thing... but FWIW, I had a 2019 G63 (now 2025) and I towed a car hauler with a bmw m3 on it from Scottsdale to Los Angeles and back over a weekend, in the summer when it was 110+ degrees.
I had zero issues, nothing concerning, no surprises. At the time my G63 had about 50K miles on it. Like I said not quite the same story, but thought id offer my experience. and I would have no hesitation about doing it again.
I want to say the trailer was maybe 18-20 ft also. Probably 1500-2000lb trailer and the M3 3500-4000lbs. So I was towing anywhere from 5000-6000lbs through the desert up the hill from Palm Springs in to AZ on the way back. probably 8-900 miles total over a weekend with zero problems.
Looks great. This speaks to the cooling system performance, that it can handle added load at high ambient temperature.
Questions about your rig:
- passenger and cargo load in the vehicle?
- air suspension?
- weight distributing hitch?
- trailer brakes, and if yes, electric or hydraulic?
- if electric brakes, wired or wireless controller?
Questions about your rig:
- passenger and cargo load in the vehicle? Myself, an adult male friend, some luggage for the weekend, and the car thats it.
- air suspension? On the trailer? Not sure, it was a car hauler we rented from someone.
- weight distributing hitch? Great question, and not sure, im not well versed on the specs. Sorry about that.
- trailer brakes, and if yes, electric or hydraulic? Yes, it had trailer brakes for sure, and honestly couldnt tell you what type but I know for sure it had trailer brakes.
- if electric brakes, wired or wireless controller? There was no separate controller for brakes, so maybe they were mechanical/hydraulic?
The trailer did have a hydraulic/electric tilt button to load and unload. But other than that Im not too sure on the trailer specs as it was a rental. We just had the guy we rented it from check in to everything to make sure his trailer could support the car, and that G63 was capable to handle the job, which it did with flying colors. One of the more pleasant towing experiences i've had to be honest, it was planted, felt solid, didnt feel like it was being over worked, I monitored the temps constantly, and there was nothing notable the entire weekend.
Last edited by ffejnotrom; May 20, 2026 at 01:42 PM.
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