are they talking about the TPMS? if that’s the case you would just need to mount the original *wheel with a new tire on it and that should automatically reset the light. check some tire shops to see if they carry your tire
these trails were in big bear california, the ratings are actually for off-road / OHV. the ratings will be shown on a sign at the trail start and will show icons of an atv/ off-road vehicle. not necessarily mountain bike rating.
yep, so far mostly dirt fire roads a stock 2wd suv can do. but more recently did some stretches of blue rated (southern california) trails and accidentally did a part of a black diamond trail (probably the easier section).
while i’m still learning dimensions and clearance from the driver seat...
no issues with rubbing and i go off-road pretty often. my take is that they do rub slightly while articulated / at full lock but it’s a non issue. the carpet liner is very flexible with nothing behind it so it’s fine.