My question involves a traffic accident in the State of: Pennsylvania
My pick-up truck was struck by a large commercial straight truck while in a loading zone. I was inside the building at the time. I had only noticed it was hit later in the day. Due to the circumstances, I easily deduced it was hit at that location and who hit it. I filed a police report the next day and my suspicions were confirmed when I went out to their place of business afterward and located and photographed the vehicle that hit mine. The photos show evidence of scrapings on their rim and black marks from my bumper.

The owner, the driver, and eventually the company's insurance are denying any blame. The owner of the company said the driver denies hitting anything and he did not see any damage to his truck when he looked at it. He was not able to view the vehicle until 4 days after the incident due to a snowstorm, during which the truck had been making deliveries, so all or most prominent evidence was probably washed off- and that wasn't much to begin with. The truck is 28000 lbs and he grazed the fender, bumper, and wheel of my truck with his tire and rim as he was pulling straight into a tight space on a narrow street

Their insurance company basically has the attitude that because there were no witnesses, then I can not say their insured was responsible. Their position is that just because there's damage on my truck doesn't mean they did it. They can't deny the truck wasn't at the location. The driver admitted to the owner that he remembered seeing my truck there

What they do not know is I have photos of the rim of their truck showing the evidence. There is also paint from their rim on my truck on several places as well as rubber high on my fender and on my bumper from their tire.

I am 100% certain they were responsible, have the evidence, but don't know how to proceed from here. Do I need to hire a private investigator, lawyer, independent lab to get paint samples, or what? The conclusive evidence is the transfer of paint. There's probably about 1500-2000 worth of damage to my truck. I dropped full coverage last year due to the age of the vehicle, so can't file a claim through my insurance.

I'm concerned they might try to hide the evidence by changing the tire or rim.

Any help or advice would be greatly appreciated
Thanks in advance