In all honesty, the X will tow right at it's rated capacity (if not a hair over) fairly well.
As mentioned, Trailer brakes are mandatory. (requirement for 1000+ lb. load)
As far as a weight distributing hitch; what you really want is an anti-sway device that is connected to the hitch.
I use my X to tow my car/trailer combo on a regular basis and have been doing so for nearly 4 years. The stock leafs are up to the task as long as you don't surpass the 500lb tongue weight and the only thing that I would recommend, also as previously mentioned is a Tranny cooler.
An upgraded leaf pack wouldn't necessarily be a bad idea, but it's not requisite for regular towing.
On that note, power adders are a good idea as the X does tend to struggle on steep grades. The 3.3 will do it, but it will be slow going.
As another downside, don't expect anything more than 8~11mpg max while towing.
My car/trailer combo weighs in right at 4600 lbs. Add another 300(ish)lbs. in gear, tools, tires, race gas jugs and personal stuff and I'm just under 5,000.
As long as you maintain a decent maintenance regimen, you should be ok. Due to the amount that I tow, I usually change my trans. fluid every 20~25k miles and rear end every 10~15k. Obviously oil changes at every 3k if feasible as well as all the other routine maintenance.
I've never had an issue and she's towed like a champ all these years.
Hope that this is of some assistance. Good luck and happy towing!
Pic below is one of the heavier cars that I tow on a regular basis, although I have to tow this one with it's nose first due to lack of appropriate/safe tie down locations on it. The other one gets towed rear end in front to keep the tongue weight down.