Nice trailer. I've towed a closed trailer that weighed >7000lbs with my Tundra and you absolutely need a WDH hooked up at that weight for truely safe towing. It's not a knock on the truck, it's just something you need to distribute the weight on a truck that's only a 1/2 ton, you just can't compare it to a 3/4 ton, even though people try.
I like the fuel economy advantage I get with my open trailer
But really I'm just jealous of cool enclosed units.