I got rid of my Gladiator and I have some barely used sheepskin seat covers. They are warm in the winter and comfortable in the summer. Here's the link:
https://ultimatesheepskin.com/product/sheepskin-seat-covers-custom/
These came off from a Rubicon with the leather seats.
I live north of...
I also searched for sheepskin seat covers for the Gladiator. There's not much out there. I finally went with these guys:
https://ultimatesheepskin.com/best-custom-sheepskin-seat-covers/
They fit a little loose, but other than that I like them.
I have the same issue. Happens after sitting overnight, or for more than 4 hours. No check engine lights. My 2015 JKUR and my 2018 Cherokee never had this issue. I've always used top tier gas as well.