Other vehicle I am considering -- and I can't remember seeing one out storm chasing -- is a Lexus rx350. Lose some of the tech at the same price point compared to the Rav4, but the v6 is alluring, and they have one of the most reliable drive-trains out there. Assume AWD won't be any better, ground clearance about the same.
I leased a 2024 RAV for my daughter a couple of years ago, and it’s a great vehicle but sluggish. As you noted, the hybrid may be quicker.
The Lexus seems like a better choice than the RAV - same platform, but more luxurious and comfortable interior, plus the V6 as you mentioned. Not too many people chase in luxury vehicles, so that’s probably why you don’t recall seeing any

But a used Lexus or other luxury brand can be very affordable compared to newer non-luxury brands. I mean you look at something like a 4Runner and the higher end trim packages get up into the high $60k range!
I do like Dan’s suggestion of a 4Runner though, and you’re buying used anyway. That’s a true off-road vehicle, and I like the idea of having something larger, which is the primary attribute for safety in an accident. On that note, you might even want to look into a used Volvo. They have the XC40, which is probably about the same size as the RAV, or you can go a little bigger with the XC60, which is their midsize SUV. Even a 7-year old XC90, their full size SUV, might be a great choice if you’re willing to go a little higher than $20k (maybe $24k?) All of the Volvos are AWD and built their brand around safety. I have leased and owned a number of Volvos over the years, beginning way back in the late 1990s, and my wife drives a 2019 XC90 currently.
Repairs and maintenance costs do run high on luxury models, so keep that in mind as a potential variable on the Lexus, or Volvo if you consider them (although Volvo is not quite in the same strata as Lexus, BMW, etc.)
I always thought a Bronco would be cool for chasing, but that’s just based on its appearance. I don’t know much about its power, reliability, etc. I heard it’s not too comfortable, and of course comfort is a huge consideration for the many miles of driving chasing entails.