I am really surprised there hasn't been any posts about this here. Our friends in Oz have seen them for sure but most Americans haven't yet i have found.
This expedition camper trailer is built by Track Trailer and is called the Tvan! It is the most awesome off road camp/tent trailer I have run across on the net! Two problems with is I have seen (1) it is not imported into the states as of yet and (2) its a bit pricey in the 25K range.
I don't work for them but I want to make all of you aware of this product and when you visit the web sight fill out the information request and ask them when they will start to import them, the more of us ask the more interest it will generate a some thing is bound to happen.
Here is a few shots I have found of the Tvan on the net.