Get yourself an ex-Army trailer, single tube drawbar, land rover wheels and bolt pattern and built for the job, Regards Frank.
Printable View
Im about to build (more like have my bro build it) an off-road trailer for exactly the same reasons... having 2 kids theres LOTS of stuff to take with us, can do without a trailer. The upshot is that I will also buy a campert tent, so I can use it as a camper trailer when I want, but also use as a general purpose trailer (tip runs, moving stuff around etc).
Maybe go and have a talk to Carac trailers in Dandenong.
www.carac.com.au
The make basic but strong offroad ones at a reasonable price ( around the $1800 mark I think ) - they come fitted with an ORAC coupling. You can get things like brakes and canvas canopy etc fitted as well. They would probably do LR hubs but you might have to source the hubs and rims.
I've had one of their non-offroad trailers for 18 years - been pretty tough for what I've hauled with it.
Of course the ultimate off road trailer is an ex army Trak Trailer made in Boronia but they are pretty hard to come by.