Check what payment method the Jervois tow truck driver will take. Many towing companies will now offer eftpos facilities, but check to make sure as some places will still be cash only businesses.
Check with the Jervois tow truck company and also the driver to see where they can take your vehicle. They may be limits on distance and some may only tow to specific repairers.
If your vehicle has been in a accident you should check with your insurer as Jervois towing is often covered under comprehensive insurance policies.
Many of the roadside assistance packages include a towing in Jervois component. Depending on the level of cover will usually determine the towing distance that is covered.
It depends what is wrong with your vehicle to make it undrivable, if you have roadside assistance they may be able to fix the car on the spot to get you moving again without calling a tow truck in Jervois and having your car towed to a repairer.
Many Jervois towing companies offer 24/7 service. Check with the tow truck company to see of they are 24 hour.