Outstanding! I agree, 5 GB is plenty for streaming; that's all we had with our lousy home internet back when we were living in California and it seemed to work most of the time. We still went through 100 GB per month, but that was streaming everything full time.
I'm assuming you're using the WifiRanger as a bridge? I have a decent AT&T business plan on my android device, unlimited wifi and 100GB hotspot, but it appears USB tethering has been disabled on my device (!)
A cellular iPad is extremely handy on the RV. We mounted ours on the dash where we can both see it. I took the radio out of the dash completely; driver has enough work load as it is. Her Majesty can search out campsites, stream music or podcasts through bluetooth speakers*, and it serves as a fine GPS -- but only if it has a SIM, which is the main way those devices figure out where they are.
2008 Tiffin Allegro Bus