It is different in numerous ways. It probably has a weight rating that would be greater than a conventional tandem for one thing. Higher weight rating will probably mean a beefier structure/frame, so you'll be toten more weight empty. If you're not located on the west coast, you won't get any more weight allowance than a conventional tandem. And they are a bit harder/costlier to maintain, ie; tires, brakes, brgs, etc. Not talking down on them, just you might want to consider those things, before ya take tha plunge.
If Chaz happens on this, he is much more qualified than I am to extoll the virtues of a trunion axle set-up:notworthy Just, messin with ya Chaz.
You guys build some fine trailers.