First, see if this article helps:
https://www.learntorv.com/generatorsLantley is spot on. I've had portable generators and now have a built-in, the push-button convenience of starting the built-in is awesome.
I would have liked a diesel generator so that it matches fuel for my truck. I've always been iffy on propane generators. I have a nasty habit of running out of propane as-is. Your trailer will define your options, if it has a fuel tank- then you can go with gas (or, maybe, diesel); if it doesn't, you'll end up with propane.
I also think the type of noise coming out of my Onan is much easier on the ears than my Hondas. I had 2 Honda EU2000i generators. They were almost always running full bore with converter + air conditioner use. And while people claim they're whisper quiet, I didn't think they were. It was like listening to a lawn mower run.
BUT, you can definitely use much less fuel with a pair of generators. Only run 1 when you only need a little bit of power or run 2 when you need more. Over 2 weeks at the Balloon Fiesta, I went through 1/3 of the fuel than my neighbors did with their bigger built-in Onan generators. But with smaller fuel tanks, I was refueling more often.
For security for portables, the LowPro LockDown is the most secure solution I found.
And generators are all about power management like you're on 30amps. A Honda EU2000i has 1800 running watts (aka about 15amps). A pair of them is about 3400 running watts (aka about 28amps). The Onans come in different sizes; mine is 5500W or about 45amps.
