If they are Inverter type Generators then they will run the quietest... The Built-in Inverter process produces good clean 120VAC voltages and are well regulated for their specified wattage rating... The older generator technology is you have to change the generator speeds per-say to maintain good output AC voltage regulation...
What you don't want to get is one of those much cheaper contractor type generators which will be very loud. If it is too loud then you will be told to shut it down haha...
Running generator at public campground is all controlled by the camp grounds for the times available to use and such... You just can't show up and run your generator for the most part. Some public camp ground even have certain places where you can run the generator. You can bet on It won't be the ocean front view sites...
Out West it seems the restrictions on using the generators is much relaxed. Here on the East side of the US you really need to check the camp ground to see what the rules are.
Even when we camp here on the East side in the Natl Forest areas we run into generator run time restrictions... The East side has very few what is called DISPERSED CAMPING where anything goes... Out West the country side is full of DISPERSED CAMPING locations... Some of the East side Public Hatl Forest areas are just now starting to allow the generators to be used from 8AM to 8PM... Most public places still have the 8AM to 10AM and then again 4:30 PM to 8PM perhaps each day... No where we have found here on the East side where a generator can be run at a public place after 8PM at night and before 8Am the next morning. You can do this at private places like NASCAR but not at the public camping areas. I guess the public camp grounds can chose what times they want the generators to be run - there is no laws that I know of that regulate generator use...
Just alot of things to consider when wanting to run a generator... Solar panels and large battery banks is much quieter but you still will need a smaller generator to charge the batteries when you have no high sun days...
Got to blend in with all the public folks haha...
Roy ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
2008 Starcraft 14RT EU2000i GEN
2005 Flagstaff 8528RESS