I am afraid that finding a used one for that size will be next to impossible other than one that will need extensive repairs.
Check your email
I sent you prices on new and they are discounted to you as a Barner @ $500.00 below retail.
I can get a new glavinized bunk trailer for boats 32ft 12500 lbs with triple axle brakes on two for 5,775.00.. Did you look at Nextrail trailers. I believe they are cheaper and are made from aluminum. I dont have any info on them. I believe they are always in the salty dog.