Andrew,
I think a 19.999745" is the way to go - overall it performs better under various conditions.
I think it's worth the extra cost and the additional weight compared to your 19.999" should be okay if you have a friend to help you with loading onto the truck. (I would also consider the 19.99999614" which is heavier and out of my price range. Of course there are some 19.9" scopes coming out of China on ebay for about $75 - stay clear of them, the plastic mirrors are light but are near impossible to allign)
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