Sad that a toy hauler was built without a shower surround. In my toy hauler, I used the shower a LOT, due to riding my motorcycle in dust condition and being totally dirt covered after riding.
Mine was a 2003 model, and didn't have a surround. I wiped down the vinyl covered walls after every shower.
A toy hauler has the probability of being an RV that the shower gets used a lot more than in other RVs, so it's sad that the manufacturers don't see that concept and put a surround in all their toy haulers.
It all comes down to cost cutting.