Jason Boggs
EF5
I've chased in a Nissan Xterra since 2009 and I love it! No mechanical problems whatsoever! It's a 4x4 with good power and room enough for lots of gear! It currently has 210,000 miles on it.
I'm of the opinion of a 4Runner being one of the better all-around chase vehicles, but any car or truck can be sufficiently outfitted for chasing. If it's your only vehicle, I'd choose one that works for your everyday needs rather than chasing. For the average chaser, chasing makes up a small part of the overall time and miles you'll put on it. I've chased in pickup trucks, small cars and SUVs. They all have their tradeoffs (gas mileage, interior space, ground clearances), but all ultimately did fine. If I had an hour-long commute to work every day, I'd want to be driving a smaller car or hybrid than a big 4x4 I'd bought for storm chasing.
Honda and Toyota are best for long-term reliability. AWD is helpful for winter weather and accidentally turning down a mud road (it's more likely to get you the short distance back to the pavement). No vehicle is immune from getting stuck on those roads though. I'd also prioritize good tires for whatever vehicle you end up with just for wet road safety.
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've been chasing in a 2023 RAV (gas version) for the last three seasons and I like it. It has enough power to get moving quickly when needed, spacious and you can get over 400 miles on a tank. I used to chase in a 4Runner and Tacoma, but you could only get a little over 300 miles on a tank and that's without any wind resistance, and if you're chasing out in the middle of nowhere it doesn't take long for the fuel gauge to start running low and you're always sweating the next time you can fuel up.