Took some time to get back with you. Good advise from the above posts. All are worthy contenders.
I looked into generators for quite a while before purchasing ours, Cummins Onan P4500i Inverter Generator. (I now have 3 of them).
Most of the time, (for the camper) we run only 1 generator for 30 amp especially if the weather is cooler and no need to run the 2 AC's at the same time, or even run 1 of them in colder weather.
But, we have 2 we can run in parallel for full 50 amp service and can run everything (and I mean everything) in the camper at the same time, exactly like being plugged into shore 50 amp power.
I finally purchased a 3rd Onan for the house when we are gone. Our son lives in our house and works from home (Information Technology), and wanted to make sure he had very reliable generator back-up in the event of a power outage at home.
The P4500i weighs a little over 100 pounds each (empty, and no oil), add 4 gallons of gas and a quart of oil and they get a bit heavier. The do have wheels and I have a set of ramps to get them in out of the bed of the truck and in and out of the camper. When traveling, they are inside the camper (not the bed of the truck). When raining, they run under the over hang of the fifth wheel so they don't get wet.
Westinghouse make an identical (looking) 4500i and folks say it is identical except for the label and the color of the body. I don't know. They do cost a couple hundred dollars cheaper, but when it came to generators, I decided to go with the company that truly knows and support their generators. Cummins has been around for a long time, been servicing the RV community the longest, and seems to be the standard when RV manufacturers install a permanent generator in an RV.
We considered a permanent generator, but we did not want to loose any of the front storage bay space. And, I use my generators for a lot of other uses than just the camper, so "portable" and something that could power "power tools", reliability, customer support, weight, all out weighed the higher price tag on them.
By the way, I've own my first 2 Onans for 7 years now and I've NEVER had to service them, other than oil. They've been used a lot!
Click here - Cummins P4500i
Well, when I went to look up the Westinghouse, I did not find the 4500 on their web site. Looks like they might have replaced it with a 5000:
Click here - Westinghouse iGen5000 Inverter Generator
FYI: In order to run the Cummins P4500i in parallel for 50 amp, you'll need the adapter also. It connects both generators together and then and then another adapter that has the female 50 amp plug on the other end for the camper plug.