I was told there was no ATM in Troncones so I used the one at the airport. True, I would encourage everyone to do the same.
Used Dollar rent a car, nothing special, their insurance is really expensive but I didn't want problems so opted for full coverage. Haven't found any rental company I would recommened or avoid.
The Pemex station just passed Troncones did give me a cash advance, credit cards wouldn't work but a debit card did.
Didn't stop for groceries until Gaby's in Troncones, limited selection but enough to get by.