As for the LP generator, I have found them to be very fickle with the LP. Mine would freeze the tanks and stall out and also would make it hard to use other LP items at same time. The biggest pain was constantly changing the tanks out when one would empty. With the gas, you just add some to the tank and move on. The LP does burn cleaner and will give you less problems with the carb if you were to let it sit for a while unused. But that does not apply to me.
As for the washer/dryer, we have one and find it to be quite handy! We were on a month long road trip out west this past summer and are glad we had it. We did not find ourselves cramped for storage space, either.
