One of the first things I realized after I started using my 1978 Bethany Pop-up camper is that there was a fair bit of movement once it was set up. Just walking into it caused it to shift which puts a lot of stress on the camper. It also causes one to be concerned about it tipping which has happened to many others. Especially if only one of the beds are being used as then its one big teeter totter/lever and probably the last thing you want waking you up!