Microwave Size?

I upgraded to solo today and will get my truck Wednesday. I don't know which truck yet, but would like to pre purchase a microwave. Is there a size that should fit any truck? I am thinking a 0.7 cf should fit all. Do you think maybe a 1.0 cf would?

Don't worry about the size of the microwave. Biggest two things you need to know are the size of your inverter, and the lowest wattage microwave you can find. These suck up a lot of power from the batteries, even when the truck is running while operating the microwave.

I use a small, 700 watt microwave I got at Target years ago and my gauge drops from 14 to 11 volts while idling.

I have a 2020 Freightliner Cascadia and am using a .9 cu ft, 900 watt Sunbeam microwave from Target for less than $60. That fills up the cabinet for the microwave and runs just fine with the 1500w inverter, but i also don't have any other large wattage draw appliances ( like a fridge).