I tried this and can confirm that the Yuba StandTogether absolutely works on a RadWagon 4, and is WAY better (more sturdy, stable, and easier to get on/off of) than the stock Rad kickstand. It comes with a hole in the middle that lines up perfectly with the kickstand mounting hole on the RadWagon frame.
It worked fine with just one bolt, but I went ahead and drilled two additional holes and mounted it with three bolts since my original kickstand broke off while I was riding and I have PTSD / require over-engineering now. Also I load the RadWagon up with a ton of children and things; if you also do that you might want some extra bolts too.
You will need bolts that are longer than the ones that came with the StandTogether. For the middle bolt, you'll want a 2" one with lock nuts and washers on both sides. If you're adding the other two, they screw into nuts that are welded onto the StandTogether, so you can go a little shorter like 1-3/4".
I just took the ones that came with the StandTogether to the hardware store and asked for the same diameter and threading but longer.
Top and bottom of kickstand attachment pictured.
It worked fine with just one bolt, but I went ahead and drilled two additional holes and mounted it with three bolts since my original kickstand broke off while I was riding and I have PTSD / require over-engineering now. Also I load the RadWagon up with a ton of children and things; if you also do that you might want some extra bolts too.
You will need bolts that are longer than the ones that came with the StandTogether. For the middle bolt, you'll want a 2" one with lock nuts and washers on both sides. If you're adding the other two, they screw into nuts that are welded onto the StandTogether, so you can go a little shorter like 1-3/4".
I just took the ones that came with the StandTogether to the hardware store and asked for the same diameter and threading but longer.
Top and bottom of kickstand attachment pictured.