Interesting set of parameters: you already have a very capable tow vehicle in your F-350, you have already decided you want a trailer but want one that is easy to hitch and unhitch, you want one with comfortable seating which means to me that you want more than just a dinette for seating, and you want to bring your Harley along.
I think there is some "mutual exclusiveness" going on with your "wants". With the F350, if you chose a lightweight trailer such as one of the smaller Lances such as the 1685, you probably wouldn't even need a weight distribution hitch which would make hitching and unhitching much easier. However, to get the comfortable seating you want means getting a trailer with an overall length approaching 30', which would require a weight distribution hitch.
The easiest way to bring your Harley along, I think, is to bring it on its own motorcycle trailer. Obviously can't do that if you are towing a travel trailer. Perhaps a system that loads your Harley up into the pickup bed, such as this
AmeriDeck loaderBruce
