well let me clarify. My V6 4 Runner towed everywhere, but driving up to Tahoe in the mountains with 2 horses over 16h and a weeks worth of hay and camping gear was pushing the limit of the 5000# towing capacity and on some hills the rig was doing 40mph on a 4 lane highway. Like all the other rigs climbing that mountain!
4Runner are some of the highest rated SUVs for safety and reliability, and have been around for many generations so parts are cheap. I’ve had 4 of them and they usually go far over 200k miles before the engine dies - my last one at 260k miles IIRC.
So I highly recommend this for towing. I got a V8 because my new trailer is 3000# and I’ve been enjoying having the extra power for about the same mpg.
If all you ever do is drive on flat land, go ahead and get a tow vehicle with less power but bear in mind that when you get near the towing capacity of a vehicle it’s gonna put strain on the engine.
Towing isn’t yet an area where you get 30+ mpg easily, if at all. Even if you think your vehicle gets say 27 mpg, add a trailer and watch it drop. So I would let that idea go at this stage in automotive history. It’s far more expensive buy a new car after blowing your engine overloading it by towing than you’ll save on gas.