On weights, my 1988 5th wheel and 1996 camper were both well over the placard weight. The 2008 camper is over but not by as much. You can account for some of the difference in optional equipment, but I think they have gotten more honest with time, though still not honest.
If you order a new one instruct them not to put ANY holes in the roof. They build a pretty nice waterproof shell and then punch holes in it like a sieve. Some are required by regulation but many are not. I did that on the 1996 (which I ordered from the factory) and it had maybe 1/2 or 1/3 of the holes in the roof compared to the 2008 which I did not order. They could build it with none if they tried a little harder.
Adamis summarizes many of the areas of concern. I had the same issue with the propane compartment and did just what Tx did - repaired the lip across the bottom. Again I think that is regulation, propane is supposed to drain, but honestly the amount of propane trapped by that lip wouldn't even wake you if it went off. I've found the pourable sealant they use to be horrid, it just cracks away in short order. Fortunately the newer ones are sealed with butyl under the flanges, unfortunately they didn't do the best job sometimes. The only thing I haven't removed and resealed properly on the latest one is the bath vent.
Like Adamis, I still consider Bigfoot to be at the pinnacle of quality in a production RV - but the valleys in that industry as so very low, the pinnacles don't have to be high to stand out.