Mike,
I have no direct experience with the G8's or the 8411 floor plan, but suggest that you do check out the atrium overhead windows carefully. An available option was the 400 HP Cummins engine and that would be an advantage in a coach that size if you are towing a car/truck/trailer with it. The aqua hot is a nice feature as well, one that I do not have in my coach but would like to have...
The wheel base on that 8411 is 276 inches where mine is 288 and the 8411 is a foot shorter than my 40C as well, so you should not have any maneuverability issues -- mine is not at all hard to drive or park (don't ask my wife if she ever closes her eyes...
) There are some parks and other destinations you may want to visit in rural areas that don't allow coaches over 40 feet, so is that the 'accessibility' issue you are concerned with?
Like any other low volume build (this is true of stick-built residential homes as well) there is always a "punch list" of things that need to be put right initially and this varies from unit to unit -- hopefully the prior owner was knowledgeable and conscientious about getting those things looked after. I bought my coach used with just 8K miles on it and have found a few things to fix/improve. The entertainment electronics were mediocre at best...I have since put full HD capable screens in both the salon and the bedroom. At least they were flat screens to start with so not much cabinet modification was needed. Is your front TV a flat screen or an older CRT type?
I found one convenience outlet did not work and it came that way from the factory. There was a minor leak in the drain for the washing machine that I found when I upgraded the washer to one with more cycles to select from (wife did not like the one that came in the coach...) We took the old unit out ourselves -- great fun for a couple of senior citizens in a cramped space. I used my shop engine hoist to take it out the front door of the coach as the machine was just an inch narrower than the opening (co-pilot seat had to be removed.) Sears delivered the new washer into the coach, two strong men could do that sort of thing where my wife and I could not...
I have added shelving in the kitchen base cabinets and changed all the faucets to higher arch contemporary ones.
One more thing -- has this coach you are considering had the Norcold refrigerator upgraded on the factory recalls to prevent fire? Maybe it already has a 110 only residential refrigerator installed in its place -- lots of on-line discussions of this conversion for coaches of this vintage.
There are a few members of this site with Friendship rigs of various years, maybe one or more will chime in with some more specific recommendations. Let us know what you find in your inspections, what your mechanic finds/recommends and ultimately what you decide.
Chuck