John,
I agree with all the others that a ladder is mandatory. There is a lot going on up on the roof. Soonr or later you will want to be there. You bring up a good point though. Here is a shot of a ladder installed with the top flanges installed on the curve of the roof. It is going to take some extra caulking to ensure these are not rain collectors.
With regard to the Inverter/Generator decision that has been explained too. Here is a photo of the Xantrex RS3000 Inverter installed over the optional battery compartment on the curb side. The access to the inverter is from the curb side basement storage hatch.
With the Inverter and 4 6-V batteries installed you can dry camp and have 12V and 110VAC power within reason throughout the coach -all powered from the bank of batteries. Of course, you will need to re-charge those batteries sooner rather than later. That can be done by connecting to campground power -- the inverter has a very capable battery charger built-in. Other sources of energy to refurbish the batteries are solar panels and the generator you mentioned. If you want to run big items like an Air Conditioner while dry camping you will need a generator. It will power the coach and re-charge the batteries through the inverter. So you see the inverter and generator compliment each other. They are not mutually exclusive.
Click here to view more pictures of the battery installation and other areas of Mobile Suites.
I hope this helps you work out your requirements.
Rodeworthy