Last few RVs I had the 2 - Honda 2000 units and I loved them for how quiet they were and I would only need 1 to just recharge batteries and run minor appliances. 2 if I needed A/C, microwave or hair dryer. What I did get tired of was handling them as I get older and worrying about locking them up. Also, if we were on the road it wasn't convenient to pull out the trailer's power cord and run it to the truck. I finally made this setup which worked better for those road stops but I found it shook the trailer too much to leave them there if we were camping so back to moving them.
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This trailer I went with an on-board Onan. I can't tell you how much I love the convenience. They are a bit noisier but I'll take it. I think the rule of thumb is about 1 gallon of propane per hour is what I've heard. Not very fuel efficient. I only run mine a few hours a day to charge the batteries and run the evening chores like microwave, etc. When I go somehere fishing when I'm really off the grid for an extended period of time, I will take a couple extra propane bottles with me.
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