But I also see a ton of such RVs being towed on the roads all the time. And I know lots of truck guys that regularly tow, period.
This is a legitimate test and comparison for this reason: California has banned the sale of ICE vehicles by 2035. I can guarantee you that even in the state of California, there are hundreds of thousands of people who own trucks with which they tow large RV trailers. Or large, enclosed trailers for work. Or double axel utility trailers for work. And they put hundreds of miles on them in a day while towing.
EV trucks are not ready to be real trucks. Absent some major break through, they won't be ready by 2035, either. So spare me the "nobody actually tows with their trucks" bullyewt because the truth is, millions do.