That's a lot of trailer for an F150. Sure, you'll be able to physically move it. It might even tow "okay". But, you'll probably be over every weight cap that your truck has.
In my own case, I tow a #4500 fully loaded travel trailer and while I'm waaaaaay under the tow cap from the above list, I'm at the trucks GVWR of #6250 when I'm all hitched up and ready to roll. I'm over a ton UNDER my GCWR of #12500 too, but since I've reached one of my caps already, I can't really tow any heavier of a trailer, because the additional tongue weight of a heavier trailer will put me over.
Now, my truck is not going to just break if I exceed the GVWR, as I've done that before with just payload in the bed...... But, I also want to have a decent towing experience and not have to fight the rig the whole way to my destination..... Also, towing puts a different kind of strain on the entire truck and depending on the road conditions and route you take, you might not like the results of towing something that weighs more then you do.
Also, towing a #8000 boat is way different then towing a #8000 travel trailer. Wind resistance is the biggest factor on a TT. You have a lot of surface area in front and the sides of that thing. Not near as much as on a boat, so the boat will tend to tow 'easier'.
It's really up to you and your comfort level of towing. What's comfortable for me is not necessarly comfortable for you and visa-versa......
IMO, that's too much trailer. I'd stick to one that has a GVWR of no more then #6500 on the trailer, but that's JMO....