Trailer Weight vs Truck Capacity (I know, I know....)

There are options available for the F-150 that put it right up there with the F-250 in rated payload and towing capacity. BUT likely by the time you add them all on, you might as well buy a F-250. In your shoes I would seek out a knowledgeable person at a dealership that sells a lot of both types of trucks, and get the details of what each option adds and what they cost.