Why not use the ports, or posts provided by the truck to jump off another 12 V ice vehicle. It seems like that should be where you would be able to get power for what you need.
I read somewhere that the batteries in these trucks were designed to take 1000 charge cycles.
I understand that that means like TWO 1/2. charges equals one charge. Or four. 1/4 charges equal one charge.
The more efficiently you drive your truck, the less you will have to charge it. Hence the...
Tried disconnecting your battery for 20 minutes or so and then reconnect. That may reset your modem and you’ll be surprised that you might be getting updates again.
Yes, I had that exact same problem when my truck was a day old. I took the negative terminal off of the 12 V battery for about 20 minutes and reinstalled. My truck started to update and everything worked fine after that.