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Pre-purchase questions of a petrol-driven electrical generator - cos you guys know best! Thanks! Answered

I have a caravan in a remote location and I've got round to thinking of buying a petrol-driven electrical generator. I'm figuring on using this with an ethanol (E85) fuel. I'd really appreciate some help if you can to any parts of my queries. I have looked around on Google for advice but there's a lot of conflicting stuff as usual and I know you guys are good. My normal max load is around 4,500watts but I have security HID lights which have a huge inductive start for a few millseconds - how will a suitably rated generator cope? Do I always add a 20% margin to the generator capacity so for a 4.5kW load I should get a 6kW machine? Or is it not 20%? Given that the machine will be outside, I don't want to annoy the other caravanners, so if I build a sound-proofing box with just an outlet for the exhaust, could I expect the noise to be reduced signifcantly, given a lot of noise will be coming from the exhaust itself? The machine has a tank of 15litres but I want to increase this safely - how could this be done, if at all? Safety is paramount (naturally) but then so is convenience. Do you have a generator? If so, what do you wish you knew beforehand or any regrets? What kind of maintenance schedule is there and is there a performace improvement for modding the air-intake to a larger filter like for cars and bikes? Many thanks for reading my question and thanks for your time to reply.