Mate, I was in exactly your position earlier this year. My wife, 8 year old boy and I have just returned from 16 weeks on the road. We did from Sydney to port Augusta , up the centre through the Kimberley, all the WA coast across the bottom and home via Broken hill. Heaps of rough roads and tracks GRR, into the Bungles and the like.
Prior to the trip when considering what to buy, my wife insisted on a hard floor. Considering g budget, it was either an import or second hand. I opted to go the second hand path. I was looking at Aussie Swags and KImberleys. I came across a Cape York trailer, which was manufactured out of Cairns. I ended up flying to Melbourne to look at both a KK and a CYT. I took the CYT.
It is built very strong, the frame being 100x50x 4mm.... Not sure anything these days uses 4mm steel. It has exceptional load caring capacity. A tare of about 965kg and Gross of 1660kg. I'm not aware of anything that comes close to that. In addition, under the bed just swallows gear....almost as good as a soft floor. When comparing to the KK and ASwags, this was a massive plus as they have a drawer that in comparison doesn't come close.
The body is aluminium which is how the weight is kept down.
The reason I mention this is there was a guy selling one on here recently, which was dropped in price from 18 to 14. That's a bargain in my mind. I paid over 20 for mine and have no regrets. I was planning on selling mine, but based on this one on the market I'd probably drop more coin than I'm prepared to..
Anyway, ours never missed a beat on our lap, tows like a dream and is up and down in 5 minutes. It's a cracker. If you come across one, don't discount it.
Is there a down side....well.... I like the kitchen setup on Aussie Swags better, where the kitchen swings around to the Side of the camper. That is just my preference but obviously not a show stopper for me as I still bought it. Good luck with what ever you do.