I have a 2005 Bigfoot 1500C8.2 The smallest Bigfoot made and it is incredibly strong comfy and impressive. I assume the NL's are comparable. Much stiffer and sturdier than the many stick built units out there and leakproof, pretty much.
I bought it last year and it had sat unused for 5 years. Took it to the car wash and scrubed it down, waxed it and it looks brand new. Redid the sealant around that hatches and stuff on the roof and good to go for another 5 years.