The RV dealer noted the rear end was wired for the coupler from your trailer........you still need a TBC at the other end!!!!
chit!! more $$$$$$!!!
google ford 2014 dash integrated trailer brake controller and choose "images" to verify what one looks like.
Good news is that Ford has a coupling up under the dash.....into which you can plug a harness to attach an aftermarket TBC.....
Better news (other than the ~$175 you will spend on the harness and controller) is that etrailer.com has a DIY video showing you step-by-step.
Go to etrailer.com and type in the info for your explorer.....they will list recommended goodies for towing with the howto stuff.
Like others, I bought the Tekonsha P3 with a GMC harness and followed the info for my 2004 Sierra.
I took maybe 60 min, with most time devoted to deciding where to drill holes under my dash to mount the TBC.
Do these things.....then circle back to the first posts....where all us happy helpers were assuming you already had a TBC and needed to adjust it.
Best news.....you will be astounded at how much easier your rig will brake when the trailer is actually braking itself!!!! So far it has only been pushing on the back end of your Explorer.
Lucky for you that your Roo is so light...though in a full on emergency brake situation it would have added 30-50 feet or more to your stopping distance.
Ask your questions here....one of us has already made that same error!
Lucky for you, we learned and are willing to share.