Same drill. You likely will be able to remain under your weight limits, but the drivetrain may not be happy due to wind resistance at high-speed.
I just remembered that the FORD TOWING GUIDES
include a frontal area limit for each vehicle. Looking at the 2014 guide, on page 13, the limit for an Explorer:
-w/o class III tow package = 20 sq-ft. That's a standard short/wide popup, or a narrow-medium-height utility trailer.
-with class III tow package = 40 sq-ft. That's a high-wall popup or a tall/narrow utility trailer.
Most modern campers are now 8ft wide and at least 8 feet tall from bottom of frame to top of roof. That's at least 64 sq-ft, and that's being conservative. The drivetrain is not intended to be pulling a full-height brick of a camper.
The choice is yours, but you will likely find the transmission constantly hunting for the right gear. And it could prevent the torque-convertor from locking up, driving up transmission temps.