Find Brent & Dixie on Discovery and follow their lead.
A lot of time and work went into a proper set up when the TC255 was about to hit the market. Others got close, but cut some corners to "save a few dollars" or offer a less exspensive trailer. You need to get this correct.
My opinion and I think a double/triple axle set up line is in the area of 6500 pound s, which the TC255 with twin anything and boat water loaded will exceed, so go triple axle. Also, be sure to look at electric over hydraulic brakes and a weight distribution hitch. The 3 items combined with proper trailer build will for sure give you a great trailer set up.
Also, may want to touch base with THATAWAY and other owners for a little "if I did it again" talk.
Byrdman