I can't speak to a 2016, but I do have a 2018 F150 with the 3.5 EB. Tows my 7,000 TT really well. 9,000 is really pushing the limit for a half-ton. At 9,000 lbs, you're looking at 1,100 lbs+ tongue weight, plus the weight of the WDH. You'll likely run out of payload before anything else. The 3.5 EB is a towing beast, but the truck itself is still just a half-ton.