Like combined weight of the car and trailer about 4000lbs.

If you’re asking about towing 2 tons with a 126, if it’s a keeper, don’t. If it’s a beater, I hope the brakes are up to snuff and you’re experienced at towing.

Sixto
98 E320s sedan and wagon

Having towed a car trailer with a truck rated and designed to tow that kind of load, I'd suggest several extra pairs of pants if you're seriously contemplating doing it with a W126.

__________________
Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Right now my truck is down, its start of race season. My 91 560SEL has way more power and brakes then my 83 F100 does. Just saying what springs would i need. I lost all my microfiche material in the flood to get spring rates and pn#'s. I Really dont think any spring will handle that much touge weight, Its a light car 2700lbs trailer light too not even 1000lbs. If i could post a pic id show you. I took the Hyd struts off it has the smaller coil rear springs now. I need the stiffest rear spring they have or make with the thickest spring pad also.

Consider renting a truck. Seriously.

__________________
Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

My concern, even more than the springs or brakes, would be the transmission. Being I just had to replace the trans in my 300TE at 140,000mi, I wouldn't tow anything with a Mercedes. Agree with renting a truck or just buy a cheap beater truck to tow the distance and sell it when you are done.

There are many variables to this but I don't see a big issue doing this. ( I've towed lots of stuff.)

Nearly anything can tow anything else, just depends on how far and how fast you want to go.

Some bits.

Two axle trailers are more stable to resisting sway and somewhat less sensitive to tongue weight.

If the brakes on the trailer are working properly, the trailer will not overload the cars brakes, ever.

Springs are only an issue with heavy tongue weights. However since you have altered the rear suspension, you may need to go with stiffer / taller springs. Given you do the race car thing, look at using race springs The 2 1/2 coil over springs will be too small, but the 5" Ford front / 5 1/2" GM front stock car springs would be better.

Load equalizing spring bars between the trailer and car would be a good idea.

Google shows a 91 560SEL to be 4,100 LB , and the F100 about the same.

The F100 should have 5 on 4 1/2" wheels, this means very small brakes / suspension. The 100 series was a very light weight truck, think Ranger but a bit bigger.

An external trans cooler would be a good idea, get one large enough and bypass the rad cooler. For a high capacity off the shelf unit, look at a 01 to 10 Chrysler PT Cruiser. These are wide and short making them easy to fit at the bottom of the rad. There are a couple of variations of this unit so dig around.

Why are Americans such towing pussies? The rest of the world managed to tow heavy trailers without the use of full size pickups and SUVs.

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CENSORED due to not family friendly words

Just want to know how their transmissions held up. Not saying you can't do it, but I'll never put a hitch on my 300TE. I have a 72 Chevy 3/4ton C20 Custom Camper that I tow trailers with. Cost me $1300, which is about 3/4 the cost of a rebuilt Mercedes transmission without shipping.

I have a 3/4 ton utility trailer I pull with a W202 and was looking around for towing capacity, it wasn't listed in my manual. The closest I found was a similer Mercedes that was rated for 3000 lbs with a trailer brake and 1500 lbs without.

Delete Post Please " I guess i didn't word this Post the right way ?

The weight being towed is 4000lbs. My car is a 1991 560SEL. its an okay car ,not that nice of a car like new i mean .But its my most driven car at just 400 miles a year. Trailer does have brakes on the rear of the trailers axle. My Trans. Am not worried about it has 5 clutches on both K1& K2. Car has almost 270K. 200k on the motor a set in it 10 years ago. Just rebuilt the trans. Am a Factory trained MB Tech Retired after 30 years.
Hell i've seen 76 240D with trailer hitches pulling boats with a Fuzz Buster on the dash lol. Am not renting a truck , right now its wrecked , the drag strip i just 48 miles round trip. I dont run do much but need to be able to go on moment's notice.

If you're worried about it put a trans cooler on it.

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CENSORED due to not family friendly words

I will run it through my Fuel Cooler on my AC hose lol. My AC is always on. Not worried about the trans just the rear level of the car when weight is on it really.
My F100 has 5x5 lug pattern Pulls good and stops fair with the rear drums, its got a 351W out a 94 F250 and it has working ac and heat.I Maybe buying a 07 used F150 Lariat for 5900. Super clean ,Then i could sell both Benz and my old truck. for 4000.