According to the 2011 Motorhome Guide to Dinghy Towing; the Explorer FWD & 4WD automatic can be towed 4 down at up to 65mph. Special procedures are: run engine at the beginning of each day for 5 minutes (shift into drive then reverse and neutral ) and then every 6 hours.
Brian, Loretta & Daisy (Golden Retriever)
2008 Holiday Rambler Endeavor 40 PDQ , ISL 400
2014 Ford Explorer toad