Dos anyone know a location to put all your treasure... and not have it disapear later? Sort of like the "Stronghold" in BG2?

Theres a chest in Dragons Eye near the entrance that I used and had no problems with

Go to Conlans Smithy, open up his locked chest, get his awesome item, free storage, and you visit kuldahar frequently so its very convient.

There's also that little house in Kuldahar, in the complex where the ale house is. It's to the right. That nice woman doesn't mind high level massively armed adventurers that keep all sorts of things in her cupboard. Best of all it never seems to run out of space!

I had the same concern, so tested by placing in several different chests in Kuldahar and everything has remained in those locations so far, even after visiting HOW and returning.