In some coaches, there is storage under the bed. This is generally accessed by literally lifting the flat platform under the mattress—often from the foot of the bed. This is an excellent place to store extra shoes and items you don’t need to access on a frequent basis. You may need to use storage boxes.
Coach manufacturers are getting better at sealing these areas from outside dust and dirt. If you have a diesel pusher, be careful not to store anything that is sensitive to heat under the bed, since this area may get quite warm.