It is not the best way to store them but it won't hurt it just make sure there is good padding at the tail.

A better solution would be to lay them flat on shelf racks. Go to Home Depot or Wal-Mart and get 2 adjustable shelf tracks and 8 10in arms along with some insulation for plumbing pipes. It is very inexpensive and a better use of the space. Look in the background of this picture and you can see what I am talking about.

Have fun.