for more then 3, ie much taller id go w/ steel or metal fram of some sort, much taller and im sure id have sway.
id do a metal frame, some sort of "rollers" to slide em in and out easily.
but w 5, youd be looking at 8-9 foot tall, doable...
you could possiblyl even do em side by side to cut down on height, depending on how wide they is.