Welcome aboard ! Are you looking at a used or a new trailer? A new trailer they will built you one for your boat specs which they already know. If they don't know ...walk away.
Now if you are looking at used this could be a long road. A triple axle with brakes on at least one axle, with the capacity to handle 12,000 pounds, with the bunks aligned up with the shape of the hull of the 3000 is what your looking. Did you know the 8 foot port side bunk , the inside edge is cut at a 45 degree so not to hit your water pickup for your head? Call some trailer manufacturers and ask questions. These trailers are hard to find used that will fit your 3000 exactly, so keep that in mind also.
This should get you started.