On our 06 Starcraft Travelstar 18sb you ended up with a puddle on the floor from the shower as the curtain doesn't contain all the spray. I caulked all around the bathroom floor, the toilet, and the bottom of the control side shower wall where it met tub basin. This kept the over spray from doing any damage, I then use the towel to clean it up or leave one on the floor to collect it while it happens. For me the shower stall is just too small to avoid the issue.
The 19ck looks a bit different but I'd do the same thing. Seal it up anywhere the water can get under or in the walls. Do NOT seal all around the tub surround, it has to be able to expand/contract, at least that was my impression.
I also had the shower control crack even though I had it full of the pink antifreeze, pretty easy fix.