Why do you think it should be a 2006 and not a 2007? You can't go by the VIN as that's when the chassis was built not the MH. It's very common for the chassis to be a year or two older than the body.
my thoughts;
it looks very clean and well cared for. The fact that the dealer has so many pictures means they don't seem to be hiding anything and in the video they point out issues which seems very forthcoming. The mileage bothers me. It's only about 2k miles per year so it may have sat for long periods of time. I'd be curious to know genset hours - low is not good for those either. If the weights are correct on the ad there is very little room to tow a vehicle. Looks like only about 2500 lbs capacity left. Looks like they are right on avg retail from NADA. Low retail is $27k. You can bet they traded it in much less than 27k, but I am sure they had to detail it etc. Check for leaks, roof condition, inside cabinets and bins for signs of water etc. He says the tires are 2016 so that's good and saves you money there. But all in without seeing it, it looks like a very nice coach.