In an effort to reduce weight and cost, many entry level trailers do not have some components that we "expect" will be in place. The shower surround is one of those components. Most wallboard is vinyl covered and some manufacturers have elected to rely on that vinyl covering to function as a shower surround. As Chuckster said, you'll need to protect it by wiping the walls down after showering. That's one of the "costs of a less expensive trailer"....
My guess would be that the manufacturers weighed the length of time people keep an entry level RV, the cost to repair during warranty, the convenience of use, the ability to make a unit that's affordable to more people (lower initial price) and the number of people that can be exposed to RVing. Given the length of time "most" consumers keep an entry level RV before moving up, I'd suspect there's a trade-off between the vinyl lasting long enough and being a problem.....
As for your trailer and the "not included shower surround", there are several shower surrounds that can be adapted or simply installed in the shower space you currently have. If maintaining the current vinyl covered wallboard is not acceptable, do some research online and in RV catalogs. I'm sure you can find a shower surround that will fit the shower/tub area and can be installed either as a do-it-yourself modification or as a dealer installed option.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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