Hi--I have an '06 Supercrew with the 4.6 liter V-8. I want to tow a travel trailer. How big of a trailer can I tow with this vehicle without putting an unsafe amount of strain on the truck and its motor? Thanks in advance! Bill

 

Hopefully this will help:
https://www.fleet.ford.com/showroom/...06_default.asp


Edit:
Go down to line item #16 and click on that link for F150. It will then pull up a PDF of what your particular engine/cab rating should be.
Looks like it's right around 6,500lbs for your truck.