Sure, you can plug in the 30 amp female - to - 50 amp male converter plug, but you're still limited to pulling that maximum 30 amps. Camco says they have an answer: They call it their "Power Maximizer." Think of it as a two-way tap that pulls that 30 amp juice and adds that other little guy, the 15 amper, for a total of 45 amps available power. Yeah, it's not 50 amps, but it's a whale of a lot more than 30!
Here's the fine print: It works only circuits that are wired with a capacity to match the breakers; and it won't work if plugged into a GFI protected circuit. Street prices look to be around $55, but you'll be looking in all the odd places: Try J.C. Whitney on-line. It doesn't look like Camping World has jumped on board for this one yet. And speaking of on board, sorry you boat users, this product is ONLY for RVers.