I know this is an old thread, but...
I'm quite interested in the cars used through the series. A car says a lot about a person (or a family), so the Wilkersons' choice of car at different points in the series tells you quite a bit.
Their main vehicle, used throughout the series, described in various places as the 'crappy minivan', is a
1990 Chrysler Town & Country.
It's actually quite distinctive; if you believe the Wikipedia article, it was only one year that the styling was exactly like that, so we can be reasonably sure it's the 1990 model.
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Their second car in Season 4 and Season 5 is the 1988-1993 Dodge Dynasty (as was pointed out earlier in the thread).
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They also had two Ford Tempos, a beige one which Lois destroys in '6x06 Hal's Christmas Gift' and a red one which Hal crashes in '7x05 Jessica Stays Over'.
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There are probably other 'regular' cars that are used too, I'll keep a look out for any other ones that I see and try and identify them.