I'm hopefully picking up a Class A this week and was thinking the same thing. Right now, I'm planning on using a GoPro on a dash mount.

I picked up this mount for it - https://www.amazon.com/gp/product/B09BZ4KYY7

I also found one of these: https://www.amazon.com/gp/product/B09C5MLDMS
It has adjustable cameras (front and driver) with some mounting brackets and 3M tape. I'll try that out on the window as well.