You can buy locking wheels that would bolt on just like the casters do. Home Depot sells them. Just find a set with long enough bolts. Add a nut at the bottom so you can still level your game.

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Not exactly answering your question. however I would avoid motorcycle lifts. They are rather wobbly in my opinion. If you want a lift that can reach a tailgate get the 1000lbs Harbor freight lift. No need to modify the handle like everyone thinks they need to. Just go from the back, however you can still lift from the front if you put the head down. The head folded down will counter the weight. The smaller one that is also available wont reach a trucks tailgate, so don't get that one. As well, when you are done with it, the lift stores under a pin.

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http://www.harborfreight.com/1000-lb-capacity-hydraulic-table-cart-60438.html