I'd guess your trailer should have a factory rating of between 500 and
1000 pounds of BOAT + GEAR. Rating is determined by the lesser of the
frame, the springs, the axle, or the tires. I would also guess that you
have some fairly soft springs, load range is shown on the side of the
tires, axles are not usually the problem on smaller trailers like this.

Sparton is a an older trailer mfg, a quick shot through google doesn't
show any new stuff. They had a mid level reputation, not cheesy, not top
of the line either. I have a hunch they have disappeared.

Your frame is fairly well squared off but the rollers are welded on. You
should be able to figure out a drop on platform that will clear the
rollers. Make it easy to demount so you can haul the boat. I've done
this conversion a few times, it works fine but it is inconvient. It
takes a while to do the conversion, you just leave it set up one way or
the other.

Ignoramus28572 wrote:
I have this trailer:

http://igor.chudov.com/projects/12-f...raft-Seafarer/

I would like to know if it is safe, or legal, to convert it for
hauling cargo, AS WELL AS the boat. Like adding plywood and removable
stakes etc.

i