No to both questions. I always had problems with my Thetford seal. Cleaning it with a old tooth brush and lubing it with a non petroleum lubricant will hopefully resolve that. What resolved mine was a new Dometic toilet.
The bottom and top of showers are not caulked to allow ventilation behind the shower walls.
Look closely while water is running in the shower and apply just enough silicone caulk to seal the leak from coming outside. This worked for us.
2011 351RLTS Eagle, Mor/Ryde suspension & pin box, PT50C EMS
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
2017 GMC Terrain (future TOAD)
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