I put in a Joey Bed about 3 years ago in our old coach. We had been sent what they termed (after we got it) the ‘older model.’ There were no instructions available for the installation. We made a number of phone calls and finally figured it out, as we were doing the installation in the boonies.
The installation finally turned out to be clean and very functional. The mechanism was very heavy duty; and it’s important to really check on the weight-carrying claims of manufacturers. As I remember, ours was the 750# model, very heavy duty, and with 3/4″ marine ply, there was nothing that I could lift that couldn’t go on the bed.
As with any sliding bed, what you gain from the bed, you lose in space, so that’s a personal decision.