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Are you planning on painting the truck yourself or having it painted? If you are having it painted I would recommend a polyurethane paint instead of lacquer. I have painted a few cars with lacquer and while it is easy to paint and can make an extremely beautiful finish if done right, I don't think it is durable enough for a daily driver unless it is clear coated with a polyurethane clear (and this raises other possible problems such as possible yellowing and peeling of the clear). Lacquer is more forgiving for the novice painter and is much less of a health concern than polyurethanes, so if you are doing it yourself then lacquer might be your best bet, but if not I would choose a polyurethane instead.
As for putting lacquer over epoxy primer, I don't know if this is possible or not, but your paint supplier should be able to tell you. The solvents in lacquer attack most other finishes, so I would try it on a test piece first to see what happened. That way if there is a compatibility problem you won't have to strip your whole truck down and re-do everything. If you are like me, you won't have any trouble finding an old fender, door, hood, etc. lying around that you can use for a test. Hope this helps.
I agree with response #1. I would go with an acrylic enamel and clear coat if you want. A good painter can make this paint shine without clear. Also a hardener is optional-I recomend it because it will chip and scratch more easily without it. The 2 stage base/clear is becoming more popular now because of the excellent shine and durability-you might want to consider that.
I have painted with the lacquer over the self etching epoxy primer. No problem, it was recommended by the paint "specialist" at the auto store. I would recommend the clear coat also for a durable shine.