Simple answer is yes. But I recommend at least three but preferably four bearers supporting that length of sleeper in order to prevent them springing.
Here's mine....well the front one anyway. The back one is similar. 200x50 River Red Gum sleepers, dressed in thicknesser and oiled. This front deck springs a little as there's only two bearers under it despite the 1800mm width. Back one has double the bearers and is near bullet proof.
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