A little less $$ than Rolls Axle, LoadMaster and Continental. On the Continental go for the SSTA model. It has most of all the options except for the following:
Stainless Steel Disc Brakes with 14-16" Wheels
Marine shoe Style Brakes with flush
Spare Tire and wheel
Bunks Notched for Lifting Straps
Radial tires
Aluminum Wheels
Lot of other manufacturers charge you for each option. One feature I like which is standard is the "V" crossmembers and axles. This allows the boat to sit lower and makes low water easier to handle. The SSTA also comes standard with torsion axles and a fullstainless steel fastening.
http://www.continentaltrailers.com/