I have one (have had it for years) that's in the 40 watt range. It's been surprisingly practical.
I suggested 300 to 350 because it's a good universally useful size that is offered at a good discount these days.
You can use your inverter and a 12V source for a variety of things, including operating your laptop, a string of low-wattage lamps, or even small appliances. Plus, they cost little more than dedicated inverters in lower wattage ranges.
If you're the type who keeps an emergency battery charging battery in your trunk, adding a pound or two for AC electricity anywhere seems sensible.
I’ll check with Camping World and let y’all know.