Breakdown Rules / Obligations During Warranty

I have just realised that i have no idea what actions to take, assuming i am unfortunate enough to have a breakdown.

If the vehicle is still under warranty, is it a requirement of the contract to contact the nearest dealership / garage for assistance.

In my case Isuzu.

Regarding the Udonthani, Nong Khai area can anyone provide a reputable repair / breakdown garage please and possible contact number they have used

( I hope this is allowed under forum rules ) as an alternative in emergencies.

Any imput / advice will be very welcome.

I do regular runs to Nong Khai, in particular.

Thank you

marshbags