Ranger-led, always
Independent trekking is prohibited. Every group of one to five walks with a licensed ranger.

Trust & Sources
Safety on this route is decided by the boat and the captain, not by the island. These are the things a passenger can verify before paying.
Ask About SafetyEnough, sized for children if children are aboard, and reachable rather than locked away.
Ask how the captain contacts the harbour. Mobile signal is not a substitute in the strait.
There is no medical facility on Rinca and evacuation to Labuan Bajo takes 30–45 minutes at best.
A captain alone on a boat carrying twenty people is a staffing answer, not a safety one.
The most common safety event on this route is a postponed crossing, and it is the system working. Captains and the harbour make that call together, usually on the morning of departure.
An operator willing to sail when the harbour says otherwise is telling you something about every other decision they make. A cancelled day is cheaper than the alternative.
On the Island
The trekking rules are safety architecture, and they are not negotiable at the ranger post.
Independent trekking is prohibited. Every group of one to five walks with a licensed ranger.
The ranger judges it on that animal, that day. It is not a matter of personal confidence.
Stand still, stay behind the ranger, do not run. Rangers carry a forked stick to redirect an animal.
Dehydration and sun exposure cause more trouble on the trail than the dragons do.
These are fair questions and a good operator answers them without hesitating. Komodo Luxury can answer for the boats they run.