Quite a few of their trucks have APU's, the ones that do of course have inverters. I'm not really sure how big they are, but the truck I had that had an APU, the inverter wouldn't pull a 900 Watt microwave.
The trucks that I had that didn't have an APU, was wired with an inverter, don't remember how big it was, but it would run a 1500 watt microwave.
None that I know of come with Fridges or microwaves, unless maybe the new Volvo's, they might.