I don't have a WK, but the Ford Explorer 6cyl, is very similar. Both vehicles are very similar in regards to towing. If your rig is set up for towing at the factory you shouldn't have any problem towing trailers which are within the tow rating of the WK. If it doesn't have the factory tow package already on it, then it can be installed. Not sure what is required there, but it may require new shocks, etc. The main advantage of the factory tow package is that it includes an additional transmission cooler for towing purposes.
The Ford Explorer with the 220hp 6cyl., did a good job pulling a 23ft travel trailer....weight approx 3800lbs. You will need an electric brake controller for any trailer over 3000lbs...in most states. Most modern trailers in this category already have the electric brakes installed. Here is a link for electric brake requirements: http://www.towshop.com/trailer_suppl...aking_laws.htm
To make it nicer pulling a trailer at highway speeds, the trailer can be equipped with anti-sway bars and a load leveling hitch is also a nice touch.
Don't know if that answered your question, but I hope it helped. Good luck.