Yep, X4 on Kodiak.
I have Tie-Down on a Roadking, it's pretty crappy stuff, although mine seem to be holding up this year. With 18 months on the trailer it got new pads, and the master cylinder was leaking so I complained to the factory and they agreed to replace it. How kind of them. They fired their customer service guy too (finally), I guess they got so many complaints. The guy was an idiot.
It took me about two weeks messing with trying to bleed the dang thing. I finally figured out you have to bleed the calipers from the top fitting. They are universal, so they work on either side, and have two bleed nipples. So depending on which side you have them mounted, you have to use the upper nipple to bleed them. The uppers were frozen on mine, so I was trying to bleen them with the lower nipple - NOT! I ended up swapping the calipers right to left and was finally able to get them completely bled out. Used about 3 quarts of fluid before I got it sorted.
They are marginal at best. I like the description that they are the drum-brakes of the disk-brake world - definately. If/when these go I'm going to look at a conversion to Kodiak. Saw a demo at a show and they are light-years ahead in design and quality.
Leaf springs are another PITA. They rust and eventually break down. Torsion suspension for a saltwater trailer is highly suggested. I'm going to replace my springs soon, fortunately they are fairly inexpensive. I found a source online and I think they were like $35 a set.