If you have propane or natural gas, go that route. Gasoline is a PIA. You can do all the things needed so it will start right back up. But storing the many gallons of gas that is going to be needed for running during an extended outage. That is a PIA by itself.
I'm not sure I'd want to run a genny off propane - if you're using 20/30/50/100lb bottles the storage is the same issue as gas although it doesn't go bad but tanks rust. And if you've got a tank for heating/cooking you'll be competing for that propane unless you upgrade. And then there's the de-rating on Propane.
Natural gas would be the best but sizing and plumbing will have to be taken into account. It also de-rates same as propane.
Gas isn't that bad if you have a detached shed to store 10-15 gallons. I store the generator full (5 Gallons), 2 5 gallon cans, a 2.5 gallon can. I do mean to add another 5-10 gallons though. I use StaBil and MMO and rotate through using them for lawn care and once a year I dump the gas into the truck and fill it all up. If there's a disaster I can go for a while on that and within 1 hour can be in quite a few major areas to get more gas.
I've got the old 5500 watt Chicago Electric Blue generator. It works great, starts pretty easily (electric) and runs great. I'd not hesitate to buy another. I'm seriously thinking of the 3500w inverter for the camper.