A combination of high and low tension 6" springs suspend the 16" x 30" bed within a 36" x 48" frame. Elevation adjustments within a 12" - 15" range can be quickly and securely made using handle tighteners and release pins. Approach legs offer two lock-in adjustments at heights of 7" and 4". All legs fold flat for easy storage and economical UPS shipment. No assembly required.