It’s very handy to be able to reposition the trailers without having to hook them up to a tow vehicle. That said, the strike plate platform needs friction with the ground to function as an outrigger. I’ve added a second set of wheels that can be cranked down to allow moving the trailers, and then retracted to set a secure footing during deployment.
The idea was borrowed for Big White, #10.
Ham Radio Tower Trailers 