GoPower 300W Pure Sine Wave Inverter. WHY?!?

Those of you following my Instagram stories recently will have seen my portable base camp, a Taxa TigerMoth adventure trailer. This rugged little trailer came pre-wired for 120v shore power for RV park usage, and solar power, but lacked an inverter to convert DC to AC. Normally you would simply buy one of those little cigarette lighter 12v adapters that gives you a regular 120v power outlet, like this one, but I found that when I used my laptop with this on the 12v DC circuit of the trailer, it drew too much power and continually blew the fuse in