That's the main reason why I run 13.5 as well, that class is pretty much a safe bet everywhere I've raced.
here's a YUGE advantage I've learned for running 13.5:
https://www.rctalk.com/forum/threads/2wd-wheels-on-4wd.136992/
Buddy up with a fast guy, look for someone with their name printed on the back of their shirt, he's likely a sponsored driver and it's his job to help you out. Don't be shy, ask lots of questions about the program. If a sponsored driver is wrenching on his car then give him space to run his race...
I used to race both 2WD and 4WD stock classes and have experience on clay, carpet and turf.
2WD tends to be more expensive in the long run due to tire wear. I no longer run 2WD simply because of that issue.
The local track in my area ran a dry dirt glue track which offered amazing grip at the...