Berg Offroad shook up the camper scene a couple years ago when it introduced the CX6, a caravan that packs into a neat 17.5-foot-long (5.4-m) squaredrop before expanding in every direction to create a huge base camp for up to six people. The company followed up with a two-/three-person floor plan built into that same towable footprint, and now it's launched what strikes us as its most universal trailer of all: a three-/four-person CX4 sized to sleep the family in complete comfort way out in the...