737 weight loading in FS9

Hi guys, the topic says it all. yep, that's what I'm confused about; how to properly load my weights when using FS9. I'm confused because back in FS2002 all you had to do was use the load manager supplied by PMDG to load up the 737 and that would suffice. A quick look at the aircraft file was enough to confirm successful loading. But now that I'm venturing into the beautiful realm of FS9 (somewhat late I know, but that's what third world country's all about), I'm getting confused since there are two places which load up weights: the PMDG load manager and the default loader within FS9. Which one takes precedence over the other? Which one should I use? If I use first load manager and then mess with the FS9 loader will I mess up the original load manager loadout? Thanks for the replies and the patienceCheers, Victor http://www.precisionmanuals.com/images/forum/800driver.jpg