dual axel,aluminum,disc brakes,also I would price out a new trailer just to get a baseline,if the diff isn't that big,buy new,on a used trailer consider the cost for,new bearings and hubs, new tires[over 4 years old they're dry rotted,look for any hairline cracks]and the springs will probobly need to be replaced also.good luck
Aquasport Octoberfest sounds like a heck of a lot of fun