In the star "Hot enough for you?" in Mysteries of Fire Island, I need the 3 red keys to complete the level. I've figured out how to get the barrel one and the chomper one. But no matter what I do, I cannot figure out the correct way to move the transporters to allow me to cross. Of course, it can't be impossible, but after using logic to see what I can and can't do, it certainly seems that way. I'm clearly missing something.

Here's a picture of the transporters numbered. I realise that I have to send 2 down, 4 left, then ride 2 up to reach 1 and get the key. But I don't know how to get 2 down and still be in the top area to be able to move 4.
There is no magic in this adventure. There is no way to get another creature to ride a transporter.
Any ideas?