Dennis,
A couple years ago I saw a G7 with a ladder installed on the rear. It was a short ladder that came down almost to the access doors and then there was a second section
that hooked onto the top section. the bottom section came all the way down to the ground. I believe the owner added it and possibly designed it himself.
The bottom section he removed and stored it in one of the basement storage bays.
It looked very good on the G7 like it was factory installed. Being designed and installed in this way it did not hinder the access door operation.
Here is a picture of the ladder on the back of our MH:
I know it doesn't help you, but notice the connection points where it fastens to the rear cap. Those points were reinforced on the cap for the ladder. That is
something you want to consider with your installation. Make sure the cap is strong enough to handle the extra weight for some husky fellow like me (220 lbs)
hanging on the ladder.
Ron