Good find... I may have to go that route...

I have owned my RW4 for over a month now and starting to really get impatient with out of stock caboose. I want to support Rad Power Bikes, but I also want my kids to be safe. If only they could give us some indication of how long it would take for them to be in stock.

I bought these: https://amzn.to/31a8nik

They fit perfectly in grove on the bike where the pegs are supposed to go. The down side is the screws they come with are not long enough so you will need to go to the HW store and get some longer screws.