As a new Tvan owner, I thought I might comment.
I went the Tvan way as, by reputation, there wouldn't be any restrictions on where it could go. Also Track Trailer's stated business is to ensure that any product of theirs will not fail and will get you home again. I like that. Especially since I travel alone.
Now the question is, will I go to all those lovely out-of-the way places? No idea, but I believe that without the Tvan I'm possibly drawing a line under the opportunity.
As for the coffin like sleeping, I must admit that I've bumped my head a couple of times, but other than that I'm not aware of the low ceiling height. Couple of reds with dinner and sleep comes very easily.
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As for cost, I suppose value, like beauty, is in the eye of the beholder. Also, as mentioned, the resale value when I do move it on.
Like most, I've seen off-road vans, campers, all sorts in caravan parks, but who knows what their full journey is? I stayed in a CP on my way home from a week camping on the side of the roads up at Cameron Corner. It was nice to have a shower. To the casual observer was I just some wally with a Tvan that never gets dirty?
Anyway, each to their own.
Have a great Christmas
and maybe see you in bush some time.