Although not a 33RLDS, we have a Jay Flight that's three and half years old.
We are good about checking window/roof caulking, etc, at least twice a year, and 'Dicoring' where need be on the roof. We keep the aluminum exterior washed twice a year and waxed once a year (we're told it still looks new when it's clean).
We don't have dual paned windows, so can hear conversations outside (can't really make out what's being said unless the person is talking really loud), but don't notice it if tv or radio is on.
Insulation seems to keep the tt kewl when it's warm, but not warm when it's cold (not sure if that makes sense but when traveling through heat of day, our tt doesn't seem to heat up if the doors stays closed, however, when it's cold outside, the tt is also cold inside).
Do you have specific questions? Ask away. There are many Jay FLight owners active in this forum