Well today I finally completed my modifications to the sullage outlet on our Expanda OB 20.64. So for months I had looked at the designs like that of Tone and thought it looked like a much better and long term approach than to keep struggling with pushing the clear plastic hoses on that were getting stiffer and stiffer. I also wanted something that didn't stick out or below the caravan that might be collected by passing stones or rocks. However, after talking to a guy at the local agi supplies place about cam locks and getting them to fit the odd sized Jayco pipes he indirectly convinced me not to use them at all. I then came up with the below which I think will suffice. It neither sticks out or below any further. The screw connection that came with the sullage hose is easy enough to attach to it and best of all, apart from a little effort it didn't cost anything.
The other picture is the protection I have applied to most of the exposed water pipes below the van to protect them again from passing stones and rocks. My wife and I came up with it. It uses some thin foam noodles we had lying around with perforated agi pipe around that. We were concerned that just using foam tubing would not stand up to being hit by too many stones so decided on the hard but light agi pipe to protect it. Next month we will be hitting the Gibb River Road amongst other places so will find out whether these modifications provide sufficient protection.