Many of those cupboards have a false floor in them. It will require removing everything from the cupboard and checking for screws or fasteners that hold the floor in place. Most of ours are held in place by a couple of screws and then the weight of the contents does the rest. Most are two piece to make them easier to remove and replace. Hope this may help. Happy Trails Bert
2006 Monaco Dynasty Diamond IV 42' Tag, ISL 400,(new to us), Residential Refrig, 10KW Onan, Bosch Washer/220V Dryer (previously 2003 American Tradition 40W) 2010 Chev Malibu LT