I love my chicken coop/tractor, but it doesn't have roosts. The chickens have been sleeping in their nest boxes all along, which means a lot of cleaning, but it hasn't bothered me.....until now, when I'm expecting them to start laying. I can lock them in the tractor but pull up the ramp for a few days to teach them to use roosts, right? How would you install them? They free range from about 7 a.m. until 8 p.m., so they aren't locked in the small space long.