3 lights in a line, low altitude, and silent.

I want to start by saying I’m rather certain it was NOT starlink.

This happened at the end of my workday. I drive a Box truck for work. A small company and our shop is down a backroad. I had just dropped off at my last stop and was headed to the shop. Its about 9:10-9:15 at night. As im approaching my turn to head towards the shop. I noticed three lights in very close proximity to eachother in the sky ahead of me. It almost looked like one aircraft cause the lights were so close to one another. I was headed due north and it was headed east. As i stared at this thing i noticed there were no blinking lights like on standard aircrafts. And it was flying relatively low. Maybe 15,000-17,000 feet. I get to the shop about half a mile down the road and i can still see this thing. The truck is off and the only noise i can hear is a dog barking at one of the houses down the road. And this aircraft was still close enough that I should have heard atleast the faint roaring of an engine. And i didnt. It was total silence. And this thing was not moving fast at all. It looked to be traveling at maybe 20-30mph. Maybe 40. Not fast at all for an aircraft. But i honestly dont know what the hell it was. My car is in the shop right now so my dad was waiting at the shop to pick me up. His car was off as well. He saw it too. I have no explanation as to what this thing was. But i know it wasnt starlink. Im sure of it. As for the elavation of it. Im positive it was below 20,000 feet. Cause i could almost make out some sort of shape to it. But because it was dark out i couldnt quite determine if it was one craft or three. Does anybody have any idea?