Go with the Performance Trends software. I used that for the Bad Ast project and I developed all of my suspension points on the 9 day demo. I have the SusProg3D software also and never really got anything useful out of it.
The PT software has a bunch of canned suspensions in it so you can use one of those as a jumping off point for your project. Figure out what your track width, tire and wheel sizes will be and use those to tweak the points.
Pay very close attention to the bumpsteer, antidive and roll center migration.
Your biggest obstacle is the steering gear. I used a Corvette rack as a starting point and let the program optimize the control arm points after I had all of the inner & outer tie rod & ball stud points laid in. These points need to be pretty close to actual as a lot of deviation will affect the whole package.
Mark
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"Bad Ast" Astro Van Pro-Touring Project.... Heat, beat, file to fit, paint to match...
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