u/Flood-tide_below8

I have a Radwagon and am trying to find a product that would work in lieu of a Caboose (since I’ve had no luck at finding second-hand ones). Any other suppliers like Tern or Hovsco provide something that’s comparable that will work on the back of a Radwagon? Not confident in my abilities to DIY and want to make sure my daughter is safe in the back - thanks for any help you can give!