I use the turnbuckles same as GU, came with an ARB/Engel slide - got the ARB cover for 40l engel also and then had the slits put in and reinforced by my local upholsterer. Have done many outback miles and the simmo - without any coming loose. Also got another slide from 4wd systems which comes with just straps ( I think) and they have been good too but haven't used them outback much. Just went back to the turnbuckles again as I've removed my back seats, made a frame for the fridge and now it sits behind the passenger seat so I wanted it secured very well as it is now in front of the cargo barrier.