Fold outs on a Camper

I am currently working on a camper that was given to me and I am moving it to a new location in a couple of months, but one thing that I cant seem to find info on is how the fold outs work. It looks like the room literaly folds up and down to increase living space. It looks to be a manual operation but Im not quite sure. Does anyone have experience on what to expect when I go attempt to fold these bump outs in. Just to make myself clear. They do not slide out. The bump outs look to be hinged on the bottom and it pivots inwards. This is an older model trailer and I am brand new at this so any info would help.

Thanks