It was important he got there as early as possible because he didn't know exactly when the man would come to the burial site. All he knew was the day, and it was the first of every month.
The man could arrive at any time, so he had to be prepared to wait all day if necessary. So he prepared a bed roll and other necessities to survive in the wild.
He put in a lot of effort into the mission so he was ready when the convoy reached the site. Wrath was the one that spotted them as he was napping. But he was quick to train his gun on them as soon as their convoy stopped.
The vehicles were sport cars with electricity-powered engines, so they were silent. They formed a circle around the site without much of a ruckus. Only the sound of their tires crushing dirt and rock could be heard.