I'm looking to you folks for some insight who may have had both types of trailers at some point.
My wife, 3 children and I are going fulltiming for 1.5 years beginning in the fall. My wife has a 2014 Toyota Sienna she insists on taking behind us (I'd like to take my 2015 Silverado 3500HD -- too bad I can't put the van in the back of the HD and tow that!)
I'm really struggling with the decision of open vs closed. The biggest consideration for me is, the van has to be able to move it to an overflow lot or parking space. I've seen some of the storage lots at family campgrounds and I'm not taking a 45' coach into them.

The van has a towing capacity of 3500lbs. but this wouldn't be a road venture, just shuffling around.
So, I like the simplicity of an open trailer - no crawling around the wooden box of an enclosed trailer and shoehorning my 6'3 280lb. frame in places it doesn't belong to secure the load. It's lightweight (I like the Featherlite 3110) - so no problems moving it.
That's where it ends though. I lean towards an enclosed trailer only because I can bring my tools, our bikes (bicycles), and give the vehicle an enclosed/damage free ride. I also have a '70 442 I'd likely use this for to transport to shows when I'm done.
Open trailer for light weight, ease of load? Enclosed for security, more versatility?
Thanks for the insight/tips!