take the small panel off in front of the shower (should be 4 screws) and look inside to see if there are any 2x4's or something supporting floor . Mine did not have enough ,so I added a few more and glued or siliconed them in place.
It was a rainy few days at Algonquin Prov park...tarps kept us dry.
Wayne --Belle River (Windsor), Ontario
2013 Sunset Trail Reserve 25RB..
2015 White Chev Silverado 2500HD 4x4 (6.0 l gasser)
2003 Mountain Star 890SBRX Truck Camper