Have you ever been on a ladder and discovered there is nowhere to put a tool, cleaning stuff or whatever down....your pockets are to small and your third hand just isn't working. This happen to me today while cleaning the roof of the TT. SO I disappeared to the workshop and built a platform for the top ladder rungs using 1/4" Baltic plywood for the base and 3/4" x 2" poplar cut in half @ a 16degree angle for cleats. When placed on the top rungs the cleats are snug against the outside edges of the two rungs and holds the shelf from moving. It works.
I'm back on the ground just in time for an adult beverage