Should be OK the way you plan on mounting bracket on the exterior wall, I would also use some butyl tape behind bracket as well for added protection. It can be difficult to find enough studs to use in the location you desire, your TV is a recent model it should be pretty light and may not require that many anchor points to keep it in place while parked.
Other methods we've done for outdoor tv usage are mounting an articulating arm or sliding tray within a storage bay which can make it easier to anchor. When we started RVing we would put TV on outdoor table, it is rare we watch TV outside anymore since kids are grown and gone, unless the sun was down it was a pretty washed out picture during the day anyway.