As for the Coleman Mach 8 9200 btu roof AC, yes it does get a small camper cold.
I just installed one on a TC.
92-94 degrees, full sun, 900 feet elevation, condenser side facing the sun, and plenty cool inside.
Again today while working in camper I ran AC. Though it was in the 80's this time, I only had to set the thermostat halfway (it runs on a dial, not a specific number) to keep it cool and on Low fan speed.
It is quiet (for an AC) inside on low, High fan speed is more noisey, not what you want to sleep to.
It does get loud outside only because there is a smaller fan running over the condenser coils and there is wind noise from the air moving past the grill on the shroud too. This noise is outside, who cares, and not inside.
So far I am happy.
I have yet to pull out the 2200 watt generator, but I imagine it is more than enough to run this