For this little trick you will need a couple pieces of fuel tubing, a pair of pliers, and a sock. This is pretty easy and I find it very simple and yet it works well. All that's needed can most likely be found somewhere in your house. Today I was re-building my shocks and thought I would document what I have done to stop bottoming out. The problem with the Stampede is that the esc and motor are all in the rear. If you ever drop your Stampede (loaded) you will notice that the front shocks don't even really move. Atleast mine don't. My rear are the ones that take most of the shock when I land from a jump. This will stop bottoming out, and if you do it right be a very wise modification. I have always found it hard to find a balance between shock weight oils. The thicker oil IMO is way to slow at rebounding, but good for jumping. The thinner oil is good for bumps as it's very quick. This also has to do with pre-load, but that's another day.
Here is what you do. First you will need to uninstall your shocks. I only did the rear, because like I said, that's where the weight is. After you uninstall the shocks, take out the spring/spring retainer, and bottom cup. You should be left with a bare shock. Now that you have the bare shock apart from the spring and other parts of the shock, you can begin. First, rap the sock around the shaft. Then hold onto the shaft with pliers. The reason you use the sock is to stop from scratching the rods and losing performance.
Now that you have ahold of the shaft, simply unscrew the rod end at the end of the shock. From here, you simply add as much fuel tubing to the shock rod as you want. As you can see in the picture, I did quite a bit. The longer the tubing, the quicker it will stiffen the shocks. The really high jumpers would need more than the average basher. Don't add too much. You still want the shock to be able to move enough where handling doesn't suffer.
Now just do the steps in reverse, assemble the shocks, and install. You might not get the fuel tubing exactly right the first time, but you can always just add a bit later. Not really anything else will work the same as fuel tubing, so there is really no substitute I can think of. Pictures of final product:
Hope this was some help, and happy bashing. [8D]