I have seen trailer kits for small boats and canoes in magazines for as little $500. Do a search on the net.
I would go that route before buying used surplus trailer.
Old bearings and dry rotted tires, rusty axles that have been in salt water can be a mo-fo. And you'll have to get the older trailer through inspection. That means buying fenders etc. new tires, etc. I know, I've been there. Save yourselve from the headache. A free old trailers is worth less than what you pay for it, even if you get it free.
I would go that route before buying used surplus trailer.
Old bearings and dry rotted tires, rusty axles that have been in salt water can be a mo-fo. And you'll have to get the older trailer through inspection. That means buying fenders etc. new tires, etc. I know, I've been there. Save yourselve from the headache. A free old trailers is worth less than what you pay for it, even if you get it free.