I often use the UK web site since it provides configurations similar to the rest of Europe, but is in English. www.bmw.co.uk
The increased towing capacity code is 233. In the UK, it is a no-cost mandatory option with the electric hitch, code 3AC. Given that it is a no-cost option, I suspect that it doesn't have anything to do with air suspension. That wouldn't be free IMO.
Now a potential problem. That code appears on the web site as being specific to the SE model (I looked at the 30D). There is no 35d in the UK. The issue appears to be around interference with the various rear aprons. Not saying it wouldn't work, just that it may not be a legitimate order combination with your 35d.
The coding that is required for a US model (and probably similar for a Euro model) is simply to get the vehicle to recognize that the trailer wiring module is connected. It is like a plug and play device that is sitting there but not recognized. (similar to a CD player in Windows that sometimes doesn't get recognized when installed). There is no logic in the reprogramming to provide new functionality, that functionality is already in the vehicle. There may be issues in getting a Euro vehicle to recognize US wiring, and vice versa. I would look to other expats for that info.
Since it is a US model, why wouldn't you just get the US hitch and wiring, keeping it all in the family so to speak? That would be the simplest from the vehicle standpoint.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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