Combination Lock - secure?

I need to buy a decent combination lock to secure the bikes to the bike rack. I'm forever losing keys, so would rather not go for a key lock. I need either D lock or padlock style as I have a long security cable and a heavy duty chain.
I noticed combinations locks are rather lacking in security ratings - are they basically easy to pick or something?
I was thinking of this:
http://www.toolstation.com/shop/Safety+%26+Security/d200/Padlocks/sd2540/Squire+Combi+All+Weather+Padlock+/p15618
anyone got any recommendations?
I noticed combinations locks are rather lacking in security ratings - are they basically easy to pick or something?
I was thinking of this:
http://www.toolstation.com/shop/Safety+%26+Security/d200/Padlocks/sd2540/Squire+Combi+All+Weather+Padlock+/p15618
anyone got any recommendations?
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I have motorcycle chains and padlocks but still don't like leaving the bike on the rack for any length of time.
Am I better off with keys are they THAT pathetic? At the end of the day the rack is aluminum and there are limited secure places on the Van body to secure a cable to.
Stretching & Workout Vids
probably not that much worse, sounds fine for that useage.
Put the bikes in the camper and sleep in a tent.
Desmond Tutu