Use Ikea Knuff magazine files as under sink storage holders. Screw a magazine file holder to the inside of kitchen cupboards. Add space to store more bulky items like chopping boards, cleaning products etc.
Be ready to demonstrate your RV is suitably registered, licensed and insured. The RV is full of nooks and crannies a massive trash can't fit into easily. All little RVs are going to have even smaller kitchens.