I use this for my 5th wheel setup. You can buy cheaper, but you can't buy better.
I got it for $1785 delivered. Electric start and pull start. It is extremely quiet and has "ECO-MODE". The engine throttles down depending on current draw. It will run my 15000btu AC on high for about 12-14 hours/tank. I just can't run the microwave and the AC at the same time. If I don't run the AC, it will definately last the 20 hours advertised. It is a little heavy to be lifting it into the back of a pickup very often, but you can get a wheel kit to roll it into a toy hauler. You literally will not know that it is running.
Honda Power Equipment - EU3000IS