[Padgett]

I have a 2500/2200 generator that starts the AC just fine at sea level. Understand it must be derated abouve 2,000 feet. Either way a 4kw peak should be pleanty

On generator or 120vac, the batteries will take the same time to charge. How long depends on how big the batteries are and the charge rate.

If you have a 2720SL (there is no LS) with the front slide out & sofa like mine, the battery is in the rear compartment and not accessible when the TM is closed. If I knew it wasn'y going anywhere for a few months, I'd pull the battery and put in the garage on a wood plank and attach a little float charger.

Stock fresh water tank was 20 gal though I understand a 40 gal was available. Do not think you would want a fresh water tank bigger than the gray water tank.