Our old TT had a wet bath and it was fine. For a small unit it was a better use of space. More room in the shower than many separates. We had a shower curtain on a ceiling track that started behind the toilet and covered the door. The curtain kept the mirror/med cabinet(behind toilet) and TP and towels(door side) dry. Close the lid on the toilet to keep the seat dry. Ours dried quickly.
The best part was at the end of the trip, you could hose the whole unit down, toilet and all.
On a small unit (ours was 15'), I would rather have a bit more living space than bathroom space.
Norm