Replies'll be interesting. I've thought the same thing. The advantages are clear. Problems are at least that we'd need a second or different 120V panel (breaker box) to serve the other 120V "leg" that makes up the second branch of the 50A service. Some of the (forgive me if I use wrong terminology) "primary" wiring (shore tie, main feed into breaker box) would have to be upgraded.
That's all do-able. I'm more concerned that a 30A coach just doesn't have the branch wiring to spread 50A service across enough outlets to take advantage of it. That's when you think of say, Coffee Maker and Toaster. They might be plugged into different OUTLETS, but are more than likely to be fed by same WIRE and same Breaker. And if that branch is 15A, we should not up the breaker to 20A.
We have a 15000A/C and 1000W microwave. Our 30A will sometimes trip using just those two (plus yes, the Converter). So far we just do Load Shedding. If A/C is running, only one other high load AC appliance: Micro, Toaster, Coffee, Hair Dryer, Water Heater. That isn't as bad as it sounds except for forgetting. For example, we often turn A/C off during a meal, so we turn the Water Heater on. By the time we want the A/C back, there's hot water for the dishes. But if it's a peak day, water heater on LPG is the only option.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB