It actually seems to be working now. I will repost if this changes. But to anyone interested in implementing this use the exact steps above.
I was using the Appery.io Tester on iOS and I think it maybe just needed to be refreshed.
Rick, you are the M-A-N. I was able to do it using that last line of code exactly as you said.
return '{"LoadID":"'+ jsLoadID+'"}';
Maybe you are not an amateur? Thank you that made my night! It worked with a list REST too after I added the "where" parameter.
To add to this what I would like to do is very similar to the warehouse app tutorial except instead of scanning a barcode we would like to select from a dropdown and display multiple results, not just a single result like in this tutorial.