When there's so much you CAN'T look through it, by all means! When you start filling a trailer like that... there's no way you're displaying them so you can easily access your fabrics. Maybe this is only because I have a small stash... but it's important to me to be able to go through and look at what I have, to match with other things, to find that perfect starter piece for the next quilt, etc.
Currently most of my stash fits on a three shelf bookcase. Not even loose, but in bins assorted by type (asian, batik, Christmas, etc. and/or by project). The only things that don't fit are the scrap boxes (one for cotton, one for flannel) and my big bin of jean pockets for my back-pocket quilt.
For me, personally, I would have to stop collecting when they no longer fit in my limited sewing storage space.
Sounds like this lady really lives by 'She who dies with the most fabric wins'!