Dexter will supply you a six lug braked axle down to 1700 pounds. You can order what ever weight you are looking for. I have drug my torflex on some pretty tough trails, and yet to end up with a mark on it. The cross member axle, makes the trailer much stronger also. With the Timbren you also have quite a few bolts to be concerned with.
I looked at them about 4 years ago, but just do not feel they would be dependable enough for use on my trailers. Personal choice. I have used Dexter Torflex since they started selling them in the United States. A proven product in the off road industry, IE military trailers.
I do see the advantage of no cross member, but I really have no room for a cross member in my frames there. I use the axle as my cross member which ends up about 1 inche below the water tank.
I will be starting a new build soon, and will post pictures of why I can not use this type of set up.
Good luck if you try them, I am anxious to see how they work over the long haul.
Bob