One thing you can do is to break up the combat by spreading out the enemy forces. They may have 20 men and vehicles but you can break it up into an advance party of perhaps one vehicle and 4-6 men and then the rest of the group in a "main body".
This allows for characters to not be so heavily outnumbered in such an encounter and also breaks the combat up into more manageable chunks.
There are also things like "The Last Battle" for Twilight 2000 that are made to resolve larger battles with vehicles and larger groups of people. You can find it on ebay or there are reprints of it that are available.
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