BF and NL (I do have a NL) will have less leaks in the overall design as the two piece manufacturing process is a lot less prone to leaking without the seams on the corners and in other places. BUT all campers have the same potential additional holes punched into them. As already mentioned they have to put certain things into the design to meet the codes and for function.
I do like the overall design of my NL as well as the improvements that they have made over the years but anything can, and will, leak. To think that any camper that bounces down the road at 60mph +- will stay leak free is expecting a lot. I have seen $95,000 trailers leak as well as $400,000 Class A's, even some million dollar homes and businesses have issues.
As a friend told me years ago when I was talking to him about RC cars "this is a hobby and a hobby will cost you money, no two ways about it" and that is so true about RV's. If you want a RV that will never leak, or depreciate, then either buy one and store it in a heated garage and never us it or don't buy one.
All we can do is to do our research on what we consider a suitable RV, inspect it as much as we can before purchase (even new does not mean that it is perfect), take care of it as much as we can with inspections and upkeep and enjoy it while we can.
