new member with a few questioins

[coloexpat]

I have jsut placed an order for a 2012 35D and I had a couple of questions.

I will be using the X5 to tow a kart racing trailer, the trailer weighs between 2300-2400 KG loaded. I have been able to determine the X5 can tow 2700 KG but, it also has the option of towing 3500 KG.

Is there a special code (package) I need to order to have the ability to tow 3500? If so, what is the code? My dealer (Pentagon Car Sales) does not know anything about this.

I have seen the X5 diesel with and without the air leveling suspension. Is it the air leveling suspension that enables the higher rate of towing? Which package gets you the air suspension?

I have read the thread about the towing hitches but I have a question regarding the Euro hitch in particular. Since I live in Germany and will be towing here I plan on using the factory "swan" style hitch. There are two models to choose from, one is electric (code 3AC) and the other is manual (code 235) both allow 3.5 T. Has anyone acutally used the factory european hitch? If so, how were you able to conver the american wiring to the european wiring? Once it has been coded to operate correctly does the programming remain after the car is updated during a service or, would this have to be recoded every time?

Here's my build in a nutshell. Pictures to follow once I receive it.
exterior color (can't decide between)
B06 OR, 300

interior
LUSW
4AD

options
320
456
ZAP
ZCW
ZPP
ZPS
ZTP
2LE
328
6NR

I saw on one post that the "soft close" doors would be available on the 2012 models. Is this an option that I must choose? I do not see it listed in the options I have to select from. Would this be included in one of the packages I have chosen?

I'm sure I'll have more questions once I get it (should be week 49 or 50)

Thanks for reading the long first post. Looking forward to learning from and sharing with you all in the future.

Jeff