I had a 2006 28BR and a 2011 30WR. These are heavy solid built trailers. They had the highest ramp weight rating at the time of 5000lbs. They don't use the spray on underbelly insulation anymore. I checked out a new 30WRS a while ago and it looks like they went with the sealed underbelly that most trailers use today.
They have a very flat metal roof where water can tend to collect. If I was was camping in the rain I would set the rig off a 1/4 bubble so water would run off.
We sold the 28BR because my wife just hated the sideways queen bed up against the wall. We sold the 30WR after 6 years to downsize (which turned out to be a mistake) Reason was at the time the 30WR was about 36' total length and we towed at about 12800lbs with 1400lbs of tongue weight. We thought going smaller we could get into more parks. I did not like the smaller trailer and I did not like the HD in the back of the truck. Sold the little trailer and went for another Toy Hauler.
I would have went with another Work and Play but the prices of sky rocketed So could not go there.
I know the styling has changed since my 2011 but I am pretty sure they still use FRP one piece siding. What does that mean well about 1" plywood is what the walls are made out of. I never had any trouble but my rigs were stored out of the weather. I read about guys who may have had a water leak, rot out the side around a window and it could be a real problem to fix.
I would do it again....
2017 Coleman 300tq by Dutchman Toy Hauler. 34.5 feet long and under 10k Gross. 500 watt Solar 2000 watt Inverter, 1999 Ford F250 2WD 7.3 4R100 DP Tuner, S&B Cold Air Intake, Gauges, 6.0 Trans Cooler, Air Bags.