Like @audioman58 indicated - see what they can do to up their ground. We use 200% neutral panels. Double ground is similar idea. I’d also add a nema pullbox just as they leave the panel and run the building ground through it. This would give some future options. Isolation transformer in the future if needed.
I’d also ask for load balancing unless it’s 120 coming in - and power quality monitoring for a week after install with waveform capture. They usually have or can rent the equipment to do these tests. It’s amazing what comes out of the plant sometimes and it’s an opportunity to see what you have.