3200 is pretty close to the max 3500 (2.0/V6 with the tow package). You'd be better off towing with an Explorer 3.5 V6 EcoBoost 4WD. If you do get the Edge, I'd say get the AWD with the 2.0 and the tow package.
https://www.ford.com/resources/ford/general/pdf/towingguides/15rvtt_ford_edge_r1.pdf
https://www.ford.com/resources/ford/general/pdf/towingguides/16rv&tt_ford_edge_sep28.pdf