Editor

No trash bin or water block of course. Though I have seen the bin used in a level!

The solution I found works is this:

Spoiler: Solution

Stand on the silver stairs. Stand on top of L when he goes past. When he bumps into R, stand on R quickly. Use the draggable block to make R go past the win block. Stand on the block.

@Chris Hester - Here's a level with a recycle bin
https://mekoramaforum.com/media/ball-riders.24792/

As for your win - one can win without moving B.

Spoiler

Slide a free draggable up the wedge or stairs and drop it on the win.

@Chris Hester
Your victory is interesting, but what @Meko Guy says is also true.
I won with a B autopilot on the freedraggable.
Interesting to have made the editor in one level.
I do not vote because judging the gameplay at this level would greatly lower the rating.
Instead, I take it as a very original idea.

By the way: @Meko Guy, how did you put the recycle bin in your level?

@Robot B -

I used Mekostudio to copy the block from one level, loaded in another level and pasted the block.