You have a pic of this thing? I couldn't find one on their site. Is this for the front axle? If so what they guy at TNT told you sounds right. You will need to set your caster first and foremost(I'm assuming this is what he means with the 5 degrees), then put the truss on. Depending on your setup, this may make for a crappy pinion angle. This is why people end up having to cut and turn knuckles.
Either way, some pics of the truss, and your current situation would really help people help you.
