I recently asked Camburg a ton of questions about lifting my new passenger van (with RSC). They have indeed lifted a bunch of RSC equipped vans and to date have not had any issues with the RSC system. I was looking for their bumper with the new grill. Jerry still has to dig the pictures up, but he did email me a couple pictures of lifted vans with the new front grill (and presumably both have the RSC system).
It just so happened a few days after I got the photos from Jerry the owner of the silver van (pictured below) was parked in my neighborhood doing an estimate for a resident so I stopped and spoke with him about his van. It is in fact equipped with the RSC system. He said he loved the van and had no RSC activations of any kind, even around freeway on/off ramp cloverleafs. He said the van drives great and offered to give me a ride in it, but I didn't have time.
I am fairly certain Jerry said they do not recommend changing the stock pitman arm, but I will let him explain since he is the expert. Here are a couple pictures he sent to me.