A little generator that is super quite and nice and small is a great asset to have when camping especially if it will run on the same fuel as your vehicle, admittedly I would say 700W is way to small but would be perfectly fine as a backup charger.
I have a remote start/stop generator and love it, it is very quite and up until recently I only took a single 30Ah battery with me and the big fridge and all other accessories (like media centre and projector) would need something to charge battery daily. Running a 40amp charger and the generator of an afternoon was/is a great option for keeping enough charge for the night and also supplied power for other devices to be charged/use when getting dinner ready and stuffing around at camp of an afternoon (yes I go glamping, nothing like sitting by the fire watching a movie on your outdoor cinema by the beach). Admittedly I am also the same type of person who takes a small chainsaw with them on most camping trips, who wants to exhaust themselves chopping firewood when you can pull the trigger on a machine instead and get a little enjoyment out of the chore while you are there, you are meant to be on holidays so everything should be easy and/or relaxing
With my new Black Series camper and the addition of a 40amp DC-DC charger, 40amp AC charger and the 120W solar panel all to charge the the 360Ah deep cycle battery bank ensures plenty of power is available for the the 3000W pure sine-wave inverter so there is no longer a need to take this generator with me other than when we are running a 4x4 or drone events and require the additional all day supply of a 240v power source. This of course all cost significantly more than the cheap generator listed and for only marginally more than the listed price of that generator you can get a generator that would meet most peoples power requirements (charging/running laptops etc), it will take up less room than the above items and have much more functionality as it can be used without the need of having a bunch of other equipment connected and functioning (batteries/charger/inverter) and of course is more portable. Combine the generator with a small battery that is large enough to keep your fridge running overnight and you have a great little power plant ready to go anywhere you are and can be stored in the shed when not needed.