Last year on an RV trip, connections ended up LTE at all locations. I found a way to set the preferred network type to 5G, but can't remember how I did it. The same thing is happening on this year's RV trip.
Verizon's page on the subject recommends: Settings > Network & Internet > SIMs then tap Preferred network type then choose 5G.
But on my Pixel 6 Pro under the current update of Android 13, there is no Preferred network type item to tap, on the page that results from tapping SIMs. I tried dialing *#*#4636#*#* but there is no 5G choice, only more complex ones that are beyond my current knowledge.