If you are looking for the most compact ladder to carry in the bus, a collapsible one may be the one to purchase. I've had one like shown in the picture for about 5 years and it is very compact and works great. I've used it quite often with the bus and around the house. They have a 300 lb capacity. Make sure each section locks as you open it or you could come down faster than you went up. Roger has some experience with fast moving ladders! The 12.5' model is only 34" tall when closed and is available for as little as $89.95 including shipping.