Weight has to be evenly distributed when you load your coach. My gas coach is heavy on passenger side because all kitchen, generator, batteries and larger storage compartments are on that side to make things worse when loading.
The two slides are on drivers side with small compartments under.
You have to load your coach after getting it weight and maybe have it done again so you know your as close to being even all around.
should help some more in why you need to be as accurate as possible. After the coach is built its to late to start rebuilding the coach Newmar trys to keep weight balanced as possible. Spartan supplies the chassis the coach MFG will mess up the weight.