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our downwind crew are looking at getting a trailer built, anyone got any tips/pics to get us started on the design ?
Got a trailer to adapt for a Sunova sup carrier for my E bike........but you'll be looking for something bigger? 
I bought the frame of a 4.7m Dunbier boat trailer with no rollers or skids, and had a frame welded on to that.
I'll find some pictures and post later.
I dont think I have any pictures but I used a steel hand rail system to build the actual rack parts called key clamp, there are all sorts of different brackets you can get and means you can adjust or add to it at any point.
This was the base trailer, with frame welded on.
I went for large spacing so I don't have to remove fins.
Went for 8 board capacity, but it would be pretty easy to fit 10.
I spray painted the steel with this stuff.
I got some waterproof carpet, and started to duct tape it to the cross bars. After doing about 3 I got sick of it and splurged on some Rhino Rack pads. This had the added advantage of coming with ties downs. I liquid nailed the pads as well as the Velcro fastening.
Having lost a board from the roof of the car when a tie down came off the end, I riveted saddles to the ends of the cross bars to thread tie downs through.
End result works well.
I plan to build a floor, and box in some storage for paddles and things.
P.S., went for 3 supports to cater for boards from 9' surf sup to 17'6" unlimited.
Two would probably do for a mainly 14'downwinder trailer.
Old mate recently bought a stock 7 x 5 box trailer with a long bar and had welded up a rack arrangement like Nozza's that bolts on/off. Box can accommodate other gear like paddles, wetties and other gear when in SUP mode but the box can also still be used for normal domestic purposes (trips to the tip and so forth) with the rack removed.
(edit, also like nozza, he riveted saddles to the ends of the bars to stop straps sliding off...)
Trailer weight for a 4.7m powerboat would be pretty hefty should cope with wind loading on sups.
Easy to buy the base trailer, so you have a sound, road registered base to start from.
Uprights are I think 50mm box, cross bars 50mm angle.
Engineer that did the welding thought the biggest risk was sudden braking folding everything forward, hence the brace to the ex winch upright.
Have had the thought that a Thule ski box mounted low would be good for paddles etc.
Or maybe mounted top central
Just found this thread and I am selling my windsurf trailer on accessories windsurf.
Peter
I just did this, it will fit a 14" SUP ...one day 
And its harder to steal the boards off the racks while your out playing
www.seabreeze.com.au/forums/Windsurfing/General/Windsurfer-trailer-Porn
