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Lol, there are a ton of threads on this.
In summary, the official specs of a US E70 X5/X6 are 6000lbs trailer weight (max) and 600lbs tongue weight.
The tongue weight and payload capacity are what you run out of 1st on the X5/X6. In the US where it is legal to tow 55-85mph you'll want 10-15% of your trailer weight as tongue weight for towing stability (higher at higher speeds). In the EU the maximum speed you can legally tow at 80km/h which is 49mph. Also the maximum trailer weight is 3500KG or 7716lbs, which is why you see so many EU origin suvs with a 7700lbs tow limit. But their tongue weight ratings are generally lower, than 770lbs usually, as in the X5/X6. MB GLS has a high tongue weight 900lbs (higher than most light duty pickups) and a payload to match.
Do not buy an RV camper that weighs 6000lbs empty, by the time you load the camper with propane, water, crap, and etc. It will weigh significantly more than 6000lbs. Which would be higher than the X5/X6 officially supports. Can you go beyond the max ratings? Sure, people do, and there are threads on this. But you risk wearing your suspension faster, breaking components and getting ticketed in an accident for exceeding your vehicles towing specifications. If you're not worried about those things, then go for it.
I would recommend picking a trailer that matches your TV or pick the trailer you want then get a matching TV. Its best to stay within the design limits of what your TV can do. Light duty pickups are not an upgrade.
With all of this said we tow all the time with our 2011 X5M and its a great tow vehicle much better than a F-150, less sway, better fuel economy, and better brakes.
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