With most "Smart TVs", they are running Android TV as the operating system (sometimes Tizen on Samsung. Sony uses Android TV). If so, then you can add a Chrome browser as an "App". Then, you can just use the browser to access your financial websites. It is helpful to find a USB or USB RF keyboard / mouse that is far easier to add URLs, passwords, etc to the browser window than using the handheld remote.
With regards to security, the TV (and all other Internet connected devices) should be connected to a firewall in the RV. This is typically at the Wifi Router. That firewall should be configured to allow your website traffic without allowing external forces to connect to your network. Most all financial websites use https certificates for encryption of data traffic. So, the SmartTV should be no less secure than your laptop.
You will certainly need a connection to the Internet to get live financial data updates. Cellular hotspot is the best where available, campground Wifi is spotty.
There is also nothing wrong with using Chromecast to cast the webpage from laptop to display on the TV.
And nothing wrong with connecting the TV as a monitor of the laptop, other than the inconvenience of the HDMI wire between the two.
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Originally Posted by Mark71
We only ever watch the televator and front cabin TV 's. Is there anything in the way they're all connected to prevent us from replacing those 2 Sony's with Samsung smart TV 's while leaving the bedroom and outside Sony's in place?
2018 DS 4018
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Best is to see how the existing TVs are connected. I assume they are HDMI connected to a "matrix switch" somewhere in the RV. If so, then any HDMI TV should be able to directly replace the old TV (smart or dumb). The smartTV will then need either an ethernet (network cable) or a WiFi connection to the Internet for the Smarts to work. Hard cable ethernet is always better than Wifi, but can be very difficult to install if not already existing.
Then you need a good connection to the Internet. Many posts on that subject already.
The other potential constraint is control of the TV. I am assuming that the existing TV is controlled by a simple handheld remote control. If so, that model will work for the replacement TV as well. If you have a "universal" remote, then the remote would have to be programmed to control the new TV. If by chance there is an automation system in the RV, then the retrofit is more complicated and would need to know specifics.
But, very likely the new TV is plug and play.
But...if you are just trying to make the TV "smart"...you can just plug in a FireTV or Nvidia Shield or other Android TV box to make a dumb tv Smart. That would just install into an unused HDMI port on the dumb TV. You will still need Internet connectivity to the TV stick