Technically true, has there ever been a verified report of a claim being denied, no. As stated before it's really hard for manufactures to prove a mod like an ECU tune actually caused the engine or transmission issue. They can't just deny a warranty claim just because the tune is there...
Apparently the is one Reddit post claiming a warranty claim was declined due to a tune, never documented or verified. OTT has been installed in 100's of thousands of vehicles so if this was a thing there would be more than one random Reddit post.
Wouldn't recommend starting out when there can be snow on the trail as that increases the likelihood that recovery gear will be needed.
I've heard good things about On Trail Training but have not personally taken a course.
If schedules align, I'll go with you on some starter trails like...
Was in Moab last year at this time in my Tacoma and loved the trails out there as they are so different than what we have here in Colorado (slip rock vs just rocky). Can't wait to get the 4Runner out there. Great pics.
Likly the last trail of the year. Ran Bounce School road in Colorado. A bit more technical in places than I've done before and the first time using the rear locker, came in really handy. Bonus moose sighting.
Some MODs look the same as the Tacoma but are slightly different. Larger cup holders and a dash mount for Tacoma didn't work for me although they looked exactly the same. Some do work though so it's a buy at your own risk.