Larry,
Those Camco aluminum jack stands look interesting. Plus, only $32 on amazon! The only problem is is that they are a bit of a hassle to carry around and set up compared to the jack stabilizer systems that cost ~$250.
The only hesitation I have is that the trailer will still be supported essentially by a parallelogram. The jack stabilizers use cross members to break that up and makes a much more rigid 3D space frame underneath the trailer. Those aluminum jack stands could be enough though, might be worth a try since they are so cheap.