Grerg Cartan replied:

Hi Sandra
We took an off road trailer up Googs track two easters ago; towed it with an NL Pajero auto and was quite loaded.
We had no problems at all; no bogging and damage.
Having said that - there are some longish sand hills which needed a good run-up and some of these were quite badly corrugated (heading south to north) in parts (so we did bounce a bit from time to time). Most of the track is very straight forward (but as youd know remote).
But if youre experienced, and somewhat cautious you shouldnt have any problems (provided things havent changed too much).
By way of context for my opinion, we always take things pretty easy, but do treat sand hills with respect.
Greg