Maybe you should ask a few questions of yourself. What is the intent of the trailer? Do you plan to fulltime or just a weekender? When not hauling the trailer, do you intend to haul a lot of stuff with the truck? Can you afford, weight wise, putting a lot in the truck bed while you're towing?
I have a short bed with a B&W Companion set as far back as it will go. My trailer also has the rounded corners. I've had it jacked to near 90 degrees with room left over. For me personally, we intend to fulltime once I retire in a couple years. The kids will all be grown, so no need for a lot of stuff in the truck bed. I don't foresee us needing to haul a bunch of stuff once we're unhooked. The shorter truck means we will have an easier time getting to places where a long bed truck might be a hindrance. Like parking on a street at a Triple D joint. (Love that show). Also, in my current job (US Army), I don't need a big long truck.
So I guess it all comes down to, do you really need that much truck bed space? Just my two cents worth.