Looks stout, but that photo must be distorted if that's 16' of bed. Did you measure it? These are classified by bed length, not overall length.
Those long ramps are awesome. I bought mine with the standard (48"?) drop gate, and it's too short for loading the tractor with the ballast box on the 3-point, on some grades. It's also too steep for rolling monster 1000+ lb. oak rounds up into the trailer, which is the main reason I bought the trailer (I get a lot of big oak, where I cut).
I went with the solid sides, and sort of wish I got one more like yours and built my own stake sides for it, as it would be better for moving tractors and smaller vehicles, that way.
You'll find it increadibly handy to have, now that most pickups come with nearly-useless 5.5' length beds. Mine gets used for firewood, mulch, gravel, hauling the tractor to church for clean-up days, and even hauling trim and lumber over 10' length home from the lumber yard.