Towels..wet and after use...outside on the awning strut and then on the handle for the poptop lifter above the beds. This is done when on the move as well and keeps them fresher. If you get stuck with several bits of damp clothing it's easy to string a line between the ends to dry when needed.
We also had a couple of stick on hooks just outside the shower for clothes when showering and for anything else that needed hanging, tea towels, hand towels etc.
Toilet paper...we ordered a waterproof roll holder from someone in Darwin but it never turned up so we just kept the toilet roll in a plastic bag and left it on the shelf in the bathroom with the hand wash.
The one thing we found necessary was to remove the shower head from the bracket and wrap it in something (microfibre cloth) while travelling.
Paper towels etc we kept in a plastic washing up bowl, along with cutlery, plates, cups washing up liquid, sponges coffee and tea. That was always kept together, stored on the inside table under the doona when in transit and brought outside when camped. We always cook, eat and washup outside so that made it easy. And it fits easily on the picnic table outside so is always accessible but out of the way of other pursuits such as relaxing and imbibing.
There are some good storage solutions around but your own evolve as you use the van and everyone is different.
Lots of stuff can be kept in easy reach on the top of cupboards if you're camped up for a while and then easy to put away quickly when you need to move. Lots of plastic containers, drawer liners and a basic plan works.
Have fun!
