Just to clarify, you're mixing up the F150 packages.
The HD Payload package gives you the beefed up suspension for a heavier PAYLOAD capacity.
The Max Tow package gives other features for a higher TOWING capacity, like rear view camera and 36 gallon fuel tank.
With the HDPP, I believe it automatically comes with the Max Tow package.
OP......pay very close attention to what bikendan is saying about the F150 "max tow" option vs "max payload option" there not the same.
Too many F150 owners bought into the max tow option thinking it was max....when it ain't.
Ford markets several gvwr/rawr packages for the F150;
#1. 7850 gvwr...4800 rawr....2500 lb in the bed payloads.
#2. 7600 gvwr...4550 rawr... 2200 lb in the bed payloads
#3. 7050 gvwr...4050 rawr... 1800 lb in the bed payloads
#4. 6800 gvwr...3800 rawr...1500 lb in the bed payloads.
Payloads are a estimate as only scaled axle weights will give any truck its real world payloads.
Only the F150HDPP has max payload capacities.
All the others may have the "max tow" option which is where many F150 owners think their truck is the max.
The 3.5EB engine will have no problems pulling its 10k-11k lb trailer tow rating. Pay attention to actual F150 owners on that point.