This may be way off base, and may not even work on a Gen1 truck, but I'll put it out here anyway.
When Greg at PRG installed the new front coilovers and UCAs on my Gen2 truck, he did an alignment in his driveway with a crescent wrench and a tape measure. He then had me take it for a fast drive over the unpaved road (with some bumps etc) behind his house, and made a few more adjustments. That alignment was about perfect, and held up for a very long time.
I've heard that the actual procedure is not all that difficult, and I wish I had paid a lot more attention to what he was doing at the time. I've also heard that the procedure is laid out someplace online, but I don't know where.
Something to think about.