Tension rods are just that TENSION rods. I do not trust them. Why? They are TENSION rods relying on tension. Any shift in a camper could cause the tension to fail. We have one in our tub/shower and it fell. Not a good situation. Being a wood worker as a hobby, I have the tools to create a more substantial shelving solution. Noting the attached pictures, I created a PVC system that will not fall. I used PVC pipe to create the standards on which the wire shelving bracket are attached. I sanded the lower pole ensuring it slid easily into the upper pole. Pole caps were glued and screwed to the cabinet base and ceiling. Yes, I have no fear of screwing, 1/2” screws into the ceiling. A D ring was used to hold the poles in place. The total pole length was ¼” shorter than the distance between the base and the ceiling allowing no pressure on the ceiling. The assembly is dismantled, removing the D ring and the assembly and shelves are placed on the table/bed area for storage during PUP collapse.