GM onstar car connect questions

joebedford wrote:
If you leave the key in accessories position, the hotspot stays on. However, unless you're charging the battery externally, it will go flat pretty quickly. Ask me how I know - I flattened the batteries in my 3500HD three times by mistake by using the internet hotspot.

How long did it take to drain the batteries? Have you tried leaving the truck connected to a trailer while connected to shore power or generator? I was hoping the trailer charger could keep up with the hotspots battery drain.