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Is 50mm x 50mm x 3mm galvanised box section strong enough as the main drawbar/spine to carry a Shetland 535 suntrip?
 

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Hi
Dont think 3mm wall will be up to the job best to go for 5mm wall for axle and draw bar.. I had one in 3mm and bent both axle and draw bar on a speed bump and was not going fast over it
 

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width wise, you are tied to whatever your hitch will fit, thickness will depend on trailer capacity and section depth and length.... If we are talking a "T" type trailer then you will be talking nigh on a full length so possibly even 8mm wall, depends what section you use....
 

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If you are building from scratch I would use 2 lengths of 50 x 75 thick wall with welded in cross bars of the same to hold them apart so you could mount the keel rollers on them. You could then build a sub chassis to put either single axle or twin, up to you. Use u bolts to connect them together so you can adjust the balance. Make sure the sections are sealed so sea water wont rot it away from inside. Bolt on a thick plate at the front to mount your tow hitch, a caravan one with handbrake and jockey wheel would be good.
 
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