Drop it to 60. You'll be pleased. I run 55/60 in my Transit unless I'm loaded and I go up accordingly in the rear. Most I ever run, even with 4k in the back, is 70.
I have never even thought or heard of basing ones tire pressure on worry of getting sued. If this is the world we live in I probably won't be here long. A VAST majority of people the world over have no idea what their tire pressure is, never check it or think about it and most of them get by fine with an occasional flat or blowout. I'm certainly not recommend this but surely there are more important things to worry about. Sasquatch attacks, validity of the flat earth theory, what our president might do tomorrow.
Enjoy your Sprinter and welcome to the gang!