If you remove the tub you will need to cap off the drain before covering the hole. Once the of trap dries out you will get some wonderful odors coming from the grey tank. I personally would not take out the tub but we use our shower. Good luck.
2008 GMC Sierra 3500 SLT DRW D/A 4x4 (Big All)
2006 Ford F350 PSD SRW King Ranch 4x4 (Henry) (Sold)
B&W Companion, 90 Aux Fuel Tank, Scan Gauge II, Curt f/m hitch, Swagman XC
2015 Forest River Sierra 360 PDEK
DW Diane, DS Michael, FB Draco and Sabian