I do have a quiet 2000 watt suitcase style generator but as I said some parks, and its becoming more parks slowly but surely are banning generators.
For a 2or3 (or 4) day weekend I want to run some 120v stuff, fan, a cpap, and have the availability of the tv if needed, I looked at upgrading my house battery, it will function all the basic 12v stuff, (keeping in mind to save enough power to bring in the awning and 2 slides when packing up) but it does nothing for the 120v stuff we want/need to run. so the length of time is not infinite or even extended, charge it up toss it in the truck and go. any longer trips are planned well ahead and reservations made with the desired hook ups.
perhaps I will look into a couple batteries and inverter, but having to deal with a multitude of components over and over and over might not be worth a thousand dollars of savings, to permanently mount it do I want the extra weight and lost space for the 75% of the time when I don't need it. Its a tough call. one advantage to a unit like one of these is I could use it at home during a power failure so I won't need to run my generator all night during a storm for the sump pump. So I suppose it may have other uses.
The ons I have linked to are in a range of sizes so sizing appropriately I may not need a large one, I should do is by a watt meter plug in and run a test doing some back yard camping, only run what I would if I had one of those and see what the demand is, and then look at the cost of units with say 25% to 50% more to allow for degradation.
Thanks for the input.