Very few people have horded like I have over the years. With that said, I keep a bare minimum on hand ! I used to have a whole garage filled with spare parts. I was sitting around admiring my shelves of NOS or nice used parts and started thinking about how much $$$ I had sitting there. My attitude was that I should buy most any parts that I found that were either a really good deal or rare. I figured I had about $20K of parts sitting around and most for years. I finally came to the realization that it would be better to spend a few more bucks when I need something rather than tie up $20K in parts that I may never use. If you can afford to keep spare parts and have the space, it is not a bad idea. However, I'd rather invest that money in more trucks. Now, I keep nothing more than extra filters, belts, a few alternators, and some other bigger truck parts (e.g., two complete dump truck cargo cover kits, some extra M925 cargo cover kits, a few sets of bows, a few deuce cargo cover kits, an M105 cargo cover, a couple dozen tires mounted on rims, and some odds and ends like NOS fire extinguishers and decontamination kits...I am sure I still have other stuff, but this is what comes to mind). Basically, I keep some supplies for my trucks and servicing items...that's it. I bet I am a rarity on this list. Most guys think to horde parts. I wonder how frequently they use them. I bet it is not often and they have a lot of money tied up in those parts. The guys that keep a parts truck or two have the right idea. They are not expensive and can sit until you need something. The problem for me is I have neighbors and I could never have a hulk sitting around.