Another thing you'll need to consider is the wheelbase. My 2011 F150 Eco is the 4 door crew cab with the 5.5' bed. I can sure feel that short wheelbase when towing in a sidewind, even with my small light trailer I get pushed around. I regret not getting the 6.5' bed, with the longer wheelbase.
Also, the "Maxtow" package is NOT the big tow package. The Heavy Duty package is the F150 option for the heavy towing. Dealers don't usually have them for sale on their lot, you'll have to order it. Heck, some dealers don't even know about it. I went in to a dealer that sells a lot of trucks, and had to show their salesman that option. Over 3000 lbs capacity with that option.
Those 2019 Chevys look real good, if you want to wait and pay sticker for the first several months after their release.