If your going to tow 2100kgs just get a diesel! I tow similar weighted car trailer setup and it barely feels it (both performance and economy)

That being said I am not sure that you'd be able to get a nice 04+ LCI 3.0d with the budget you have mind.

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2006 E53 Kalahari Beige, X5 3.0d Sport [sold] | MY13 Audi A1 Ambition | 2004 911 GT3| W124 Estate