I'll throw in my two cents for what it's worth. This is my experience. I have an older Honda 3000 with inverter. It was nosier because it is about 15 years old, but only has a few hours on it. It just barely ran my 37' rig and a/c. But, it did work, Last Summer I got a wild hair in Montana, when the temps got up to a 100 plus degrees. So, I thought I would buy one of the newer, quiter Honda 3000 with electric start and figured it would have more power than the old one. WRONG!!
I no sooner got it fired up. and it would shut down. After several tries, took it to a Honda shop, they checked it out and said it was okay, Just not enough power for my 13K a/c. Old one at least worked somewhat.
So, I traded it in on a Honda 5000 electric start (I can put a remote on it if I want to) The thing ran more than 12 hours without refill and was quite in the back of my truck. Even used it here at home when the power went out for two days. Glad I now have the 5K with inverter and electric start.