SMF - Just Installed!
My 2018 16TBS came with a battery disconnect switch inside the front compartment. Don't know if that is standard or optional.
Another way to kill two birds with one stone is a surface mounted circuit breaker like this one: https://www.amazon.com/gp/product/B00DIGK346/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1. It is waterproof.It provides for a breaker to protect the wire from the battery, that most RVs never have for some reason as well as a switch. I mounted mine on the unused break away battery box after I rewired the brakeaway switch directly to the house battery.