Use two locks of different types.A D lock can be broken with a bottle jack, but a bottle jack is useless on a cable lock. Some professional thieves will use a portable angle grinder, which is capable of getting through any lock, but they will generallly go for the bikes with only one lock and leave the ones with two locks alone.Put one of the locks through the frame and rear wheel, and one through the frame and front wheel, and you should be safe from having your wheels stolen.
Al Webber ● 898d