Hi. Those websites I mentioned in my previous post seem to have taken most of their tech info off the site. Liability issues maybe? You do not need a support bearing if you have 1 OR 2 single u-joints. If you have 3 or more u-joints you need 1 or more support bearings. S10xGN, think about it... the driveshaft in your car has 2 u-joints and it doesn't have a support bearing. My 38 Ford PU with a power MII rack has 2 u-joints and no support bearing.
I believe the max angle on a steering u-joint is 30 degrees. But you need to check to make sure. If you get a piece of 3/4" dowel you can use it to simulate the steering shaft and should be able to see if you need 1 or 2 shaft pcs.
Hope this helps