Can I not use a cheap inverter, like the kind one gets at Radio Shack?
Is there a significant draw back to such an inverter?
Does anyone have personal experience with these cheaper inverters that simply plug into the 12v outlet inside my camper?
Has it fried your electronics?
I can send you a box of those cheap inverters. They don't work anymore but you could look them over to see which ones to avoid.
The 300W Morningstar is well regarded. I'd keep it. If visual impact is something that tears you up, find a way to hide it. It would even be possible to mount it outside the interior of your RV if you can find a way to mount it in a ventilated, weatherproof enclosure.