Answer
Before choosing or arranging transport rental, work backwards from the experience you want and the problems you need to avoid. The useful comparison points are vehicle size, passenger and luggage capacity, licence, insurance, child seats, deposit, pickup, delivery, fuel, damage rules, after-hours support and total price.
The cheapest headline price may exclude insurance, delivery or essential equipment. Ask for the full written terms before paying and inspect a rental vehicle at handover.
A dependable provider or organiser will answer plainly and will not hide an important limitation behind vague marketing language. If a safety, legal, medical or access question is involved, use a qualified source rather than an assumption.
Confirm the current terms directly, because Khao Lak services and activities can operate differently between high season, low season and periods of heavy weather.