Wolf, I agree with Carbyman my trailer uses a dura-torque setup and it tows very nicely when loaded. The trailer sits nice and low and is vert stable.

The only draw back is the trailing arms will bend if you side swipe a gutter or clip it going around a corner. This said it's an easy repair pop them out and through them in the press.

The other recommendation I would make is using an electrically activated Hydraulic system with disc brakes. This removes all the hassels associated with drum brakes and provides a lot more control than an override systems.
(I didn't know these systems existed until I saw it on my mates boat trailer)
If you have the cash make both axles braked. 

260 wrote:

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I recently refitted a large boat trailer with Sensa-Brakes like car568 is talking about. I would never build another car trailer without them, they work perfectly. They are a bit dearer to start with but well worth it, NSW laws say brakes on both axles 

How long has that rule been in place? Don't get me wrong I think it's spot on. I assume that older trailers are exempt.

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Vehicle Standards Bulletin effective from July 1991; "All trailers except single axled trailers with GTM not exceeding 0.75 tonne". "Must have an efficient braking system which operates on all wheels." There's more to this bulletin & well worth a look before building.