Keep the info coming, it is much appreciated. Most of the trailer below are in the mid 25' range, not 30'.
"I towed 5,100 lbs up moderate mountains with my S and it almost like it was not there. The trans never made it to 8th gear, mostly 5 and 6th gear at 65 MPH. Mileage was about 12. Not bad. I am surprised Porsche does not market a Cayenne better for its excellent towing capabilities. That said, I would not tow without the air suspension, and electric brakes."
"I tow a 24 ft enclosed trailer with an '08 Cayenne S with minimal problems. I'm hauling about 6,500 lbs. (3.3k for trailer and 3.2k for GT3).
Up hlils, the Tiptronic will atuomatically shift as low as 3rd gear to maintain speed (55-65 mph). And the gas mileage which is marginal to begin with dips to 10-11 mpg.
But I like driving the Cayenne much more than a pick-me-up-truck, even here in rural Virginia."
"I've pulled a 20 ft enclosed trailer (about 8k lbs loaded) for 2 years with my V8 Touareg...probably towed over 5k miles....both short trips and long trips (OH to AK). I seem to get closer to 8-9 mpg. Although the wheelbase is short, it works fine. With no wind, it's comfortable at 75 mph. Add heavy crosswinds and you need to pay a bit more attention"
"I've towed close to the 7716lb limit a few times. I've got a 18' dovetail car hauler (21' total) that I haul my track car and other projects with.
Not my trailer in the picture, but I hauled my Eurovan (about 5200lbs) from NJ to Colorado.
Tows just fine. Add a nice brake controller and it tows better than my 3/4 ton dodge with the same load! Had to tow the van to DMV to get inspected so hooked the trailer up to my Dodge so I could put the CTT back in the garage. The CTT, goes, stops, and turns MUCH better with the trailer than the Dodge (same brake controller fwiw)"
"IIRC, it is stated to NOT use a load distributing hitch with a Cayenne.
I don't remember if that was specific to PASM equipped vehicles or not.
The 'rule of thumb' is somewhat irrelevant; the governing specification/document is the manufacturer published/supplied capacities (at least from a legal perspective)."
"I contacted 3 dealer service departments regarding the WD hitch and they all said that a WD hitch is fine, but it is NOT to be used with the PASM due to the suspension auto-leveling characteristics."
"Are you using one of these to measure tongue weight?
Sherline Trailer Tongue Weight Scales
Have you read this?
Trailer Loading and Towing Guide
Here is a quick worksheet:
Worksheet for Trailer Load and Balance
"Wheelbase matters (and the Cayenne/Touareg is sort of short) as does staying well below max ratings, as does what type of trailer you are towing. This will become apparent, right before you, your Cayenne/Touareg and trailer flip over when things go horribly wrong (crosswinds, tailwagging, emergency braking/lane change, etc)"
Towing a smaller airstream