1988 trailer, old? I dont think so.... 1960 trailer, old? Yep...
A trailer is as good as the frame, bearings, suspension, tires and axle under it allow it to be, whoever made it.
I suspect Yacht built more then 1 spec'd trailer, so depending on what you want to haul w it, if its rated up to the task and is in good towable condition, sure, its s good trailer.
Neglected, rusty, no grease in the bearings w dry rotted tires, nope, not towable, maybe it could be made towable, maybe it cant be made safely towable.