DSing a Land Raider isnt nessecarily a BAD idea, just a very expensive risk. If you get a bad mishap, then there goes 250+ points gone plus anything you had inside. If it goes off well, then you can drop a massive unit in the right spot. It's just a risky thing to do, which is why alot of people won't do it, they would rather DS something like a speeder squad or something.