Our coach has a QD10K and personally i think its too much....An 8k would do us just fine.
I always expected the 8k fuel consumption to be less (until i really started looking at these numbers, posted below).
1/2 load consumption of the 8k & 10k are close to the same, but the 8k does consume more ( .49 & .43 gph respectively)
the 8k sucks a bit more fuel than the 10k at full load (1.02 & 1.0 gph respectively)....almost a quart more per hour.
the 8kw weighs quite a bit less than the 10kw (420 lbs vs 765 lbs)
the 8k has a variable throttle, the 10k throttle is constant (which might account for the 3db increase in noise).
most toter's only have one AC unit - you would be fine w/ an 6k (with plenty of wattage to spare).
I'd look at the service intervals between the units too - things like oil/fuel filter change intervals & coolant flush intervals.
the above specs came from onan - they also list other (propane & gasoline gen specs here) -
http://www.cumminsonan.com/www/html/.../rv/F-1123.pdf
__________________
Don R.
'04 Haulmark (M42386) 42', 2 slide, 10kw -
Pictures
'04 F350 CrewCab Longbed 4x4, 50g aux tank & gear vendors dbl over