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As johno90 stated most new cars a bedded from factory these days. Alls they do is load the motor up for a preiod after getting it to operating temp to ensure all rings etc bed correctly. No load on a new engine will lead to polishing bores and oil usage. Dont go to the extremes of loading it up but somewhere the load can remain constant. ( you should still be able to accelerate if need be and not lose any speed if your doing this up a slight incline for eg.)
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Driving a new or recond motor at a constant speed (eg on a highway whether towing or not) isn't good for the initial run in. It should be put through various speeds and loads like the others have suggested. That probably doesn't help you as you're half way through a long trip on highways.
