I towed a slightly longer, slightly heavier TT for 10 years with the non-Max length Expedition. Our TT weighed in just under 7000# loaded, and I kept the tongue at around 900# versus our 920# limit. At the time the Max had a lower hitch limit of 860#. Our WDH was the Reese dual-cam and once we got it dialed in we found it was fine. Because of the short wheelbase, on strong cross wind days the tail did try to wag the dog. When I sold the TT, the buyer had the Expedition Max and the extra foot-ish of wheelbase made a very noticeable difference for him.
Watch your tongue weight, watch your RAWR, pay extra attention on cross-wind days and you should be fine. Enjoy the new setup.
