I installed a lock and loaded the wedge onto our trailer. I didn't feel it was very stable when the bike was stationary. I called the manufacturer and they gave us some tips to improve stability. I tried reinstalling the device and found it had the exact same issue. It does not provide lateral stability in the event of a sharp turn on bad road surfaces. I don't think the bike will fall off the prop, but I think I'll stop often to prop it up. I also don't think it's a long term investment as the metal base plate and liner can bend or become brittle very easily. I bought three and am returning them all.