In fact, all Leman Russ tanks in a Spearhead detachment gain Objective Secured, including the Tank Commanders. You can't refund the 3 CP for the Spearhead detachment (like you would a Patrol or Battalion), but it does alleviate a significant problem that vehicle heavy lists (such as Knights) run into.
The biggest downside to Leman Russes is that they're slow, so you'll want some other units to provide board control. Sticking with exclusively tanks, your top contenders are Hellhounds or Valkyries, though a horde of Sentinels is also a good bet.
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