going to need some more information for what you are really looking for. do you want sometjing that you can out a tent on top of, a foldout tent trailer. something that is an offroad RV. and what size/weight are you looking at, whats pulling it?
Outside of that, it's super hard to say what is "best." There are some a hair bigger than what I have that add things like AC, but having actually towed mine off road a fair amount, I think it's about as big as I'd want to go. I like that it clears 35" tires by a mile too. There's not much I'd change if I was trying to make the "perfect" build... but I do really like the Vorsheer trailers too.
The perfect one is different for each person. The perfect one for me is the one in my sig. I designed it exactly for what I wanted, pretty much no corners cut. But as we all know, our needs/wants are constantly changing. I am always looking at my next mod.
The moral of the story is, get one, use it until you find one you like better and upgrade. That is the way of life and progress in society.