My older Ford E-350 has two just to the right of steering wheel. One requires key to be on, the other stays powered all the time.
Like Tfryman stated, I've only had a problem connecting a small fan motor to my modified sine wave inverter. Mostly we used it for charging phones, laptops, and cameras years ago. Now we mostly connect phones and iPads directly to a charger, so small inverter rarely gets used.
With prices being as low as they are, I'd go with pure sine inverter. Inverters can last a long time if one is lucky, and who knows what use you may have that requires pure sine in the next year or two.
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