Hi David
The number of times I've been there, I've never seen a trailer of any kind in there.
I think it would depend on which way you went in. Neither would be easy with a trailer. The Swan may be too big for the tracks. They are very windy in places and narrow, especially Zeeka Spur track. Coming out to the south, the tracks are OK but many have some very steep rocky climbs out.
Depending on the time of year and the amount of rain, the rivers can be over bonnet depth. Not sure what vents the Swan has in the door given it would need open vents for the gas systems.
I reckon I'd leave the trailers at home.