Asking for recommendations on rental companies that allow you to drive to Slovenia. We'll return to Split though so it's not a one-way rental, just needs to allow border crossings and ferries (to Brac). I found a couple but any recommendations are welcome!
I personally used enterprise and had no issues.
Here are some guides I think might come in handy:
Brac Day Trip Guide (With a car or without)
8 BEST DAY Trips from Split (Guide) By Bus or Car
BEST Islands to visit by ferry from Split Croatia (Guide to Island Hopping)
Or you can check Croatia travel question database here which has most of tourist questions answered:Â Croatia Travel Tips FAQ