I was there in April last year. It had just been opened after being closed due to rain. We towed a Kimberley Kamper and had no issue. The track is quite sandy in some places. You need to be aware or large trucks that can come roaring along the track closer to Innamincka.
Just before you get to the end of the main track, a track to right traverses a small sand dune. Once over the dune, the track is quite sandy and quickly narrows as you start to go around the lake. When we were there, the track around the lake was closed.
There is also a small camping area at the end of the main track.
So, unless there has been rain, the track is quite easy for a well set up rig.