For camping look at an inverter gen from Honda. Expensive but very quiet. Your camping neighbors won稚 lynch you. I wouldn稚 use any 3600 rpm unit for camping...way too noisy. My friends RV gen is super quiet..... but then again the RV cost 800,000 bucks.
This gets my vote. I have an EU6500IS Honda, electric start, meets your size requirements, but it's a little too heavy for 1 person to manage without a ramp to get it into a truck. It has a meter to show how many kVA you are drawing. I have never needed the full throttle switch position. Very quiet. I run it on 100% gasoline without ethanol as a precaution. I got this one because I want it to run the second I need electric power, not after screwing around with it for a few hours in the dark. It brings its reputation with you.