It may also just be the fact that its brand new stuff, plastic included, in the engine bay getting hot for a very long time. You said this was your first real road trip. When you kick new floor/ceiling heaters on the first time, they smell like burnt plastic and/or metal for a bit too. It may go away on its own. Keep an eye on it, but don't worry too much. If you have the time, have a $tealership check it over, just in case. It should be under warranty still.
2012 Jeep Compass Sport 4x4
2.4L I4, CVT II, Freedom Drive I
2010 Dodge Dakota Quad Cab 4x4
4.7L V8, 545RFE, Big Horn Edition