One thing to watch for is the width of the camper. Certainly, with your dually, you want a wide camper so the swing out jacks do indeed get out past your fenders. Check different models to see the difference.
You want a back entry model unless you really put your trailer out there. I have a boat trailer with what they call a swing-a-way hitch and that makes the tongue longer on the trailer, but the front 3 feet is on a hinge and it swings back once it's parked.
I have a dry bath too, and a very wide camper. I like both of those things.
I also have a basement model, with a slide out on the side. You can get a pretty nice rig onto your F450, so why scrimp? The DW will thank you for your consideration.
Keep asking questions, and you will get what you really want.
