Controlling a Summit TV volume & power with a Roku remote - use Mitsubishi
The Roku Streaming Stick+ remote can control power and volume on a TV that has a Streaming Stick+ plugged in but the Roku does not have a selection for Summit TV's. Imagine that...
Through some experimentation I found that telling the Roku that it's plugged into a Mitsubishi TV did the trick and allows the Roku remote to control the power and the volume of a Summit TV.
I have two different models of (2019) Summit TV's and Mitsubishi worked on both.
2020 Forest River Georgetown GT5 34H5