Just returned from a trip to Chicago - about 2600 miles round trip. The heat in Chicago is way worse than it is out west here. I'll take our dry heat over humidity any day.
This trip puts the odometer just over 7000 miles on my 2018 RTL, which I bought this year in May. So far, the biggest issue is keeping it clean. Tires look fine. Nothing's broke yet (knock on wood).