Get the slider.. I have it on my truck as well. You didn't say what truck you have so... what truck do you have?
I got a Demco hitch because it was far cheaper then the pull rite hitches and I really like it. They are about $1,200 shipped to your house. I have the Ford prep package so it just dropped right in.. no capture plates and no under bed mounting/modifications.
Also, keep in mind that it's not just about turning radius but also uneven terrain. Think of if you are backing up into a site and if it isn't even, the camper starts to lean. Although you may clear the turn, that front cap is going to start leaning towards your cab.
Not just as simple as 88* turning radius.