Hello Sharon,
There are sometimes genuine reasons for using a generator on a caravan site, but often there are alternatives that are far less costly, and a lot better for the environment and the neighbours.
Where there is no alternative, then it pays to go for one with an inverter output. This maintains the quality of the output and should avoid any power surges that might damage electrical equipment. Generators without inverter outputs can produce power surges.
Even the best generators still produce some noise that others may find annoying, and when you look at the efficiency you may want to think again. At best the small generators only convert between 6 to 10% of the fuel they use to useful electricity. When you consider that you are paying premium price for the fuel, and the cost of the generator in the first place, some of the other alternatives can look attractive.
If you only want the generator to watch TV, then how about a second battery that is trickle charged throughout the day by a solar panel. Start the holiday with a fully charged battery, use it during the evenings at say 3Amps for 4 hours = 12Ah. Trickle charge the battery with a 12W solar panel for 10Hours during the days, and the battery will not be quite fully recharged but will supply the TV for 14 days with no problem. - Quieter and cheaper than a quality generator.
Or still using s second battery, carry it in the car ( with proper restraints and ventilated housing) and charge it whilst travelling during the day, and swap it either with the caravans main battery or provide seperate connections for the 12V TV.