We've happily taken ownership of an adria matrix 590sg. We've got pull out deeps to get into bed when the bed is at its lowest but would prefer to leave it high so we don't have to remove the headrests. There's plenty of headroom when the bed is high, but the ladder doesn't reach? It's a 5 rung ladder - which seems pretty standard. Should we have been supplied with a longer ladder or are we missing something