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So I'm going to put my 2 cents in here and make a couple of points and a guess...
points: you can stop trailers with trailer brakes or surge brakes, this doesn't impact the SAAB or what ever the tow vehicle is. this is what is done with larger loads towed by your typical tow vehhicle. The tongue weight is the item that would cause the TV (tow vehicle) to ride low in the rear. this is certainly bad because it can induce a high speed instatiblity on the front wheels (motocycle guys will recognize this as a high speed wobble) they will shake and cause steering issues. In order to successfully accept a higher tongue weight the rear suspension needs to be heavier. American big iron cars in the days of old used to have similar, if not exact, frame, engine, and brakes as the trucks of the day. You only needed to ad air suspension to the rear to get the spring rate up to allow the greater tongue weight of larger loads (after all passenger cars wanted a passenger "ride"). Most "tow packages" have a transmission cooler (or a larger one if trans cooler is stock), larger running gear (rear end, drive shaft, or the like), and some even have upgraded exhaust to aid in keeping the power output high to help lessen the load on the engine. Many are using diesels because of their inherent advantages too.
My Guess is, SAAB doesn't want the liability of having a factory blessed tow package (is it still 1000 lbs, and 100lb or so tongue weight?) because they are not interested (and I'd say rightly so) in that option for a car that sells in the numbers it does. Not enough buyers of an option (or the liability of that option) in a car that already is a small seller in the market. Pick your battles and fight the ones you can win. Not a slam, just looking at it from a business perspective.
but I still like my saabs!
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