Anyone have a proven reason why these won't work on a trailer like yours?
https://www.etrailer.com/Trailer-Axles/Timbren/A35RD545E.html
This picture seems to show 1.75" of travel. If so part of that travel would used by the weight of the trailer. Timbren does have some parts that are aimed at off road trailers, but I am not sure about them absorbing the size of offroad bumps compared to street bumps.