The road from Khandagayty to Kyargas Lake and Tsetserleg is called the Middle Route, and it's the better one. But the thing is, this particular border post is open only for Mongolians and Russians. The road from Olgii - Ulaangom is pretty bad, with water crossings.
If you want an easy west-east crossing you should take the Tashanta border post and the Southern route, Olgii-Khovd-Altai-Bayankhongor. It's almost entirely paved, but pretty degraded so not as smooth as it used to be when new.
Laurent
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