I have an Aluma 8616, V-Nose, drive on/off salt gaurds, 13" tires, brakes on all four wheels, Super-glides, Superclamp II's, and Superclamp rears. Aluma doesn't list the 16' trailer on their website, but they do custom make them for sale in Alaska...also used for rafts, so I would think you could order a 16 footer for the extra space. It has been an excellent trailer so far. I stepped up from a Featherlight 10' tilt trailer, which also was excellent, but I wanted the extra room to haul my ice fishing gear.
I spent a few years looking for a strong aluminum trailer, and Aluma's quality sold me. The 5 year warranty speaks very highly of their craftsmanship! The tongue is re-inforced with an I beam in the main tube, there is an additional tube welded under the main, and there is a bunch of angular gussets welded throughout the structure to keep the trailer strong.
Aluma trailers have two full length channels which allow you to tie down anywhere along the channel, even with the Superclamps. Mine does not have a center channel, so tying down a sled in the middle would be limited to straps or fabricating a tie down point.
The drive on/off salt gaurds are well built, but the center pin the holds them together when upright requires the use of a hammer to pop it out to lower the shields while unloading. The rear ramp has slick plastic/vinyl runners for the carbides to glide on for easy loading...don't try to walk on them though...very slick.
Highly Recommend!!!