did you happen to see my little trailer at MDU?
it's based on a dry subframe, and I am really happy with it (also only cost me $50 so that's a good thing).... I had to pull it out of a paddock and get rid of the multitude of redbacks myself
a couple of observations with it that may be interesting to you
the dry subframe that is in it does not have any telescopic dampers, so it bounces like crazy... I assume the dampers aren't there because they would intrude on the load bay. I don't know if I'll be able to add some as there just isn't any room.... the other problem with no shockers is that there is nothing to stop the radius arms falling all the way down, and the rubber cones pull out of their keepers, as do the knuckle joints - not a good thing!
my trailer has the bed bolted to the subframe using the standard subframe mounting points, it's not welded on, so I'm planning on separating them and working on the subframe
unless I fit HiLo's, the dry subframe does not have any ride height adjustment - being a trailer, I like to load it up with stuff, and too much stuff makes the wheels scrub on the guards (I need to reshape the guards as they're too narrow anyway)
I am seriously considering converting the trailer to use hydro suspension - I could quite easily make it height adjustable with a built-in pump and reservoir - the benefit of hydro is that dampers aren't required, only some form of strap or spring to stop the wheels going down too far, though I'm sure the load capacity before the bags burst will be an issue
it's still loaded up with my stuff from MDU, when I get myself sorted out I'm going to strip the whole thing and repaint it - maybe with a change of subframe, maybe not - I'm more than happy to take measurements, pictures, whatever - the bloke who built it is a very detailed engineer, it's hard to fault the design or construction!
couple of pictures if you missed it

(thanks Mick and Duc)
[EDIT] I'm thinking about hooking up the handbrakes on the subframe

the backing plates aren't there now, but I've got plenty of that kind of junk
also, my weight of 45kg is what you're after, mounted in a trailer, you might take 5kg out of that - apologies for being silly with Morris 1100, but that happens with me sometimes

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did I tell you that I won a
trophy?