Sorry, late to the party on this thread. Lots of prior discussion in other threads on this, so do a search on f150. My experience:
MAKE SURE to get both the Max Towing and the HD Payload options. Especially the second. Without the HD payload, forget getting a 5th Wheel. The truck may pull the weight, but you will be greatly exceeding the pin weight that the truck can carry. Many dealers are not clear about this option. Make sure! Our dealer ended up with a spare truck to sell because we ordered it, but he assumed it was included as part of the max tow package. It is NOT.
You're fifth options are kind of limited, but they are out there. As a rule of thumb, when shopping, do not look at anything with a dry advertised weight of over 7,000lbs. Well under that is far, far better. If you do fall in love with that 5th that is marketed at over that - work very, very hard to find out real world numbers as to what it will really weigh when delivered and then subsequently loaded. Even with the HD option on the truck, it is surprising how fast pin weight can add up.
As for my experience - search for my contributions as to my recent trip. The two that I was considering were from Jayco, and Cougar. From my sig., you can see I ended up the the Jayco. Everything is perfect on that setup, and I will be very happy with the combination for several years to come....