[RHD]

Yes. I have done it on a 28 RPU and a 30 RPU. See pictures below.
Don't worry about supporting the upright body clamp. I used Roadster dumb irons. The most important thing is to stop the sideways movement, and you can see in the last picture. On the left of the picture is a brace to stop this. Both sides must be braced. Once the brace is bolted tight the whole unit becomes very rigid. I attached a towing hitch and towed trailers for many years with no problems.