Generator questions

Although I have one, I have never used a generator. Questions are:

To charge the battery in my 2005 2720SL should I hook straight to the battery from the generator (it has the connections for the sole purpose of charging a battery) or plug the TrailManor directly into the 120 volt outlet on the generator?

Are there pros and cons for either way I do it?

Can I hook the generator straight to the battery of the TrailManor while the battery is still wired to the Trailmanor or should I disconnect the battery first?

How long should it take to charge the battery?

Thanks for any help I may receive!
THE SPECS:




Specifications: Mikoto SG1000
Super silent generator type1000 (with EPA/GS/CE)
Engine type: 4-stroke, over head valve, single cylinder,
Displacement:80.7cm3
Bore x stroke:52x38mm
Rated voltage:110v
Rated frequency:60hz
Rated power:800w
Max power:1000w
DC output charges 12v Automotive batteries
Maximum charging output 8.3a

FREQUENT QUESTIONS

How much does it weigh? About 52 lbs
How large is the gas tank? 1.3 gallons
How long will it run on a single gas tank fill? Approx. 4-6 hrs
How loud is it? 62 dbs